From fche@redhat.com Sun Mar 1 09:16:49 2015
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Date: Sun, 1 Mar 2015 10:16:37 -0500
From: "Frank Ch. Eigler"
To: pcp developers
Subject: libpcp vs. multithreading: pmns round
Message-ID: <20150301151637.GQ13422@redhat.com>
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Hi -
While testing pmwebd/webapp changes recently, I tried out the
multithreaded mode again. You might recall that this had to be made
default-off because libpcp is not actually multithread-safe [1] [2],
and that remains the status quo.
I'd like some advice as to how to improve the PMNS problems, which
appears to be the next target for some surgical fixing. The problem
here is that the libpcp/src/pmns.c globals curr_pmns (and to a lesser
extent main_pmns) represent shared resources without proper
lifetime/concurrency management (token PM_LOCK's don't cut it). A
trivial failure scenario is two threads opening one separate archive
each; one of them closes its context, thus freeing curr_pmns; the next
one goes boom at the next pmLookupName.
A few possibilities:
- making curr_pmns a per-thread global (a peer to __pmTPD.curcontext)
- putting the pmns pointers right into the __pmContext impl.h structure
to make it per-context rather than global
In the latter case, for archives, it'd just link to the ac_log->l_pmns,
and for other cases it'd link to a global read-only pmns.
Which of these (or something else) looks better?
[1] http://oss.sgi.com/bugzilla/show_bug.cgi?id=1055
[2] valgrind --tool=helgrind pmwebd -M8 ....
- FChE
From kenj@internode.on.net Sun Mar 1 14:00:39 2015
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From: "Ken McDonell"
To: "'Frank Ch. Eigler'" ,
"'pcp developers'"
References: <20150301151637.GQ13422@redhat.com>
In-Reply-To: <20150301151637.GQ13422@redhat.com>
Subject: RE: [pcp] libpcp vs. multithreading: pmns round
Date: Mon, 2 Mar 2015 07:00:18 +1100
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Thanks for continuing to push on this Frank.
> -----Original Message-----
> From: pcp-bounces@oss.sgi.com [mailto:pcp-bounces@oss.sgi.com] On
> Behalf Of Frank Ch. Eigler
> Sent: Monday, 2 March 2015 2:17 AM
> ...
> A few possibilities:
> - making curr_pmns a per-thread global (a peer to __pmTPD.curcontext)
> - putting the pmns pointers right into the __pmContext impl.h structure
> to make it per-context rather than global
> In the latter case, for archives, it'd just link to the ac_log->l_pmns,
> and for other cases it'd link to a global read-only pmns.
> Which of these (or something else) looks better?
My initial suggestion would be the first of these. A PMNS can be loaded
without any PMAPI context in play, examples are pmcd and pminfo -n
. So it needs to be per thread, rather than per PMAPI context I
believe.
From wwwrun@oss.sgi.com Sun Mar 1 14:55:25 2015
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From: bugzilla-daemon@oss.sgi.com
To: pcp@oss.sgi.com
Subject: [Bug 1055] multithreaded libpcp race conditions
Date: Sun, 01 Mar 2015 20:55:24 +0000
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http://oss.sgi.com/bugzilla/show_bug.cgi?id=1055
Ken McDonell changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |kenj@internode.on.net
--- Comment #2 from Ken McDonell ---
access.c - fixed in commit a9fe35eb
first context.c case - think this is not a problem, there is a PM_LOCK close to
entry and this is held until just before the success returns and is still held
at the FAILED label and released just before the failure return.
loop.c is dead code ... I'll git rm this.
I'll look at the other issues as time allows.
--
You are receiving this mail because:
You are on the CC list for the bug.
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Ken McDonell
changed
bug 1055
| What |
Removed |
Added |
| CC |
|
kenj@internode.on.net
|
Comment # 2
on bug 1055
from Ken McDonell
access.c - fixed in commit a9fe35eb
first context.c case - think this is not a problem, there is a PM_LOCK close to
entry and this is held until just before the success returns and is still held
at the FAILED label and released just before the failure return.
loop.c is dead code ... I'll git rm this.
I'll look at the other issues as time allows.
You are receiving this mail because:
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From fche@redhat.com Sun Mar 1 16:32:37 2015
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Date: Sun, 1 Mar 2015 17:32:20 -0500
From: "Frank Ch. Eigler"
To: Ken McDonell
Cc: "'pcp developers'"
Subject: Re: [pcp] libpcp vs. multithreading: pmns round
Message-ID: <20150301223220.GA21203@redhat.com>
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Hi, Ken -
> Thanks for continuing to push on this Frank.
My pleasure.
> [...] My initial suggestion would be the first of these. A PMNS
> can be loaded without any PMAPI context in play, examples are pmcd
> and pminfo -n . So it needs to be per thread, rather
> than per PMAPI context I believe.
Good advice! This change (plus another preceding more-obvious one) is
enough to let "pmwebd -M$ncpus" type jobs survive awhile, and run
generally faster than the single-threaded version. I haven't run the
testsuite etc. yet, so this is strictly RFC:
pcpfans.git branch fche/multithread:
commit 7c15b0df0e245d5aa6172e6ce63486339e1d2b49
Author: Frank Ch. Eigler
Date: Sun Mar 1 17:30:46 2015 -0500
pmwebd multithreading: add -M$ncpus to default pmwebd.options
Live dangerously!
d4dc41f54b9dfae76c8212bb6fbbddf7acdc166a
Author: Frank Ch. Eigler
Date: Sun Mar 1 17:17:57 2015 -0500
libpcp multithreading: curr_pmns becoming thread-specific
The libpcp/src/pmns.c globals curr_pmns & useExtPMNS becoming
per-thread variables, to protect these objects from cross-thread
reuse/conflict.
commit 90b7d2bb340152bd3fe71e62599caba18c894ebc
Author: Frank Ch. Eigler
Date: Sun Mar 1 12:11:33 2015 -0500
licpcp pmNewContext multithreading: don't reuse ac_log between contexts.
This is because different threads owning different contexts on the
same archive file may close them at different times. The ac_log's are
not reference-counted, thus shared pointers can become invalid.
- FChE
From nscott@redhat.com Sun Mar 1 19:04:45 2015
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Date: Sun, 1 Mar 2015 20:04:34 -0500 (EST)
From: Nathan Scott
Reply-To: Nathan Scott
To: Michele Baldessari
Cc: pcp
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Subject: pcp2pdf under python3
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Hi Michele,
I had a quick look at python3 support in pcp2pdf, since that
is freshly in my mind from last week, and came across a few
issues so far. The biggest being this one, affecting code in
__main__.py:
http://stackoverflow.com/questions/14087598/python-3-3-importerror-no-module-named-configparser
There's also a syntax error at stats.py graph_wrapper function
due to the extra parenthesis, not sure if that was intentional
to ensure a tuple is passed perhaps? ... (if that is what that
does?) Anyway, it seems in python3 you can't do that anymore.
Attached patch resolves a few, but I wasn't sure how you want
to go about solving that configparser issue so will leave it
here for now. Patch attached includes a few tweaks to github
URLs as well (plus some little things I may have sent earlier
but aren't merged - or maybe I forgot to send 'em through? --
they're from awhile back, anyway).
cheers.
--
Nathan
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From nscott@redhat.com Sun Mar 1 19:23:50 2015
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From: Nathan Scott
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To: Ken McDonell
Cc: PCP
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Subject: Re: [pcp] problem with containers support and qa/977
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----- Original Message -----
> This is on opensuse13.1 ...
>
> kenj@vm24:~/src/pcp/qa$ pminfo -f pmcd.feature.containers
>
> pmcd.feature.containers
> value 1
> kenj@vm24:~/src/pcp/qa$ src/grind_ctx -h local:?container=fe4564ddf901
> Iteration 4
> pmNewContext(host=local:?container=fe4564ddf901): Operation not supported
>
> Because pmcd.feature.contatiners is 1, qa/977 is run but immediately trips
> over the grind_ctx error.
Looks like there's another path through to -EOPNOTSUPP, but I'm not seeing
it so far. Does this platform/build HAVE_SETNS? (src/include/pcp/config.h)
thanks.
--
Nathan
From fche@redhat.com Sun Mar 1 19:54:45 2015
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Date: Sun, 1 Mar 2015 20:54:36 -0500
From: "Frank Ch. Eigler"
To: pcp developers
Subject: multithreading bottleneck: pdubuf.c
Message-ID: <20150302015436.GB21203@redhat.com>
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Hi -
Some systemtapping on a busy pmwebd shows a ginormous amount of
traffic flowing through libpcp/src/pdubuf.c, many hundreds of
thousands of requests per second. Each one takes a single exclusive
lock. While holding the lock, pinning/unpinning does a linear search
of all already-allocated buffers. Needs much improvement!
I'm thinking of redoing this module as a (binary tree)
lookup (for identifying allocated pdubufs by bc_buf[]-contained
address during pin/unpin), and ditching the free-list entirely (just
do straight malloc/free, which is well-tuned for single+multi-threaded
apps). Any suggestions/concerns?
- FChE
From nscott@redhat.com Sun Mar 1 20:45:35 2015
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From: Nathan Scott
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To: "Frank Ch. Eigler"
Cc: pcp developers
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Subject: Re: [pcp] multithreading bottleneck: pdubuf.c
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----- Original Message -----
> [...] a busy pmwebd shows a ginormous amount of
> traffic flowing through libpcp/src/pdubuf.c, many hundreds of
> thousands of requests per second.
The analysis lacks details as to whether this is a calling issue -
"hundreds of thousands of requests per second" is an obscene rate
of calls for any normal PCP application to be making - how many
web clients? what sampling intervals? archives/live? ... what's
the distribution of PDU types in this pmwebd scenario? Does this
match any valid real-world use or is it a test/benchmark?
Is this making use of pmwebapi_respond_metric_fetch()? If so, you
may be optimising in the wrong place - it is extremely inefficient
in its use of PCP protocol/APIs (pmDesc/pmNameID request for every
PMID fetched, for every iteration of the fetch loop, i.e. on every
sample) - as we've discussed on several occasions. Or perhaps its
some other, similar calling issue that'd benefit from some caching
in pmwebd to avoid making so many calls altogether.
cheers.
--
Nathan
From fche@redhat.com Sun Mar 1 21:00:29 2015
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From: "Frank Ch. Eigler"
To: Nathan Scott
Cc: pcp developers
Subject: Re: [pcp] multithreading bottleneck: pdubuf.c
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Hi -
> > [...] a busy pmwebd shows a ginormous amount of
> > traffic flowing through libpcp/src/pdubuf.c, many hundreds of
> > thousands of requests per second.
>
> The analysis lacks details as to whether this is a calling issue -
> "hundreds of thousands of requests per second" is an obscene rate
> of calls for any normal PCP application to be making [...]
Sorry for leaving this out: it's a routine use of graphite
interface-triggered batch archive processing: N threads scanning a
segment of one possibly-unique archive each. They fight over the
PDUbuf list, because there is only one, it is not very efficient, and
it is used a lot (every pmResult being read).
This is not specific to pmwebd/graphite at all. Count the runtime
hits to __pm{Find,Pin,Unpin}PDUBuf in any pmlog*-processing tool;
parallelizing it can't go much faster due to the same congestion.
- FChE
From nscott@redhat.com Sun Mar 1 21:02:23 2015
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Everything was good on Friday when I left :) ... but no longer.
(this was with a working pcp-pmda-papi build too, and using the
papi-5.2.0-5.fc20.x86_64 version of PAPI from Fedora20).
$ ./Makepkgs
== Cleaning build tree for packaging build
Wrote: /source/git/pcp/build/tar/pcp-3.10.3.src.tar.gz
== Preparing fresh build tree for packaging build
== Configuring pcp, log is in /source/git/pcp/Logs/pcp (--prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64 --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib --mandir=/usr/share/man)
Configure failed, see log in /source/git/pcp/Logs/pcp
configure: error: Package requirements (check) were not met:
No package 'check' found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
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Alternatively, you may set the environment variables papi_CFLAGS
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See the pkg-config man page for more details.
--
Nathan
From mgoodwin@redhat.com Mon Mar 2 01:39:08 2015
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From: Mark Goodwin
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Subject: Re: [pcp] problem with containers support and qa/977
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On 03/02/2015 12:23 PM, Nathan Scott wrote:
>
>
> ----- Original Message -----
>> This is on opensuse13.1 ...
>>
>> kenj@vm24:~/src/pcp/qa$ pminfo -f pmcd.feature.containers
>>
>> pmcd.feature.containers
>> value 1
>> kenj@vm24:~/src/pcp/qa$ src/grind_ctx -h local:?container=fe4564ddf901
>> Iteration 4
>> pmNewContext(host=local:?container=fe4564ddf901): Operation not supported
>>
>> Because pmcd.feature.contatiners is 1, qa/977 is run but immediately trips
>> over the grind_ctx error.
>
> Looks like there's another path through to -EOPNOTSUPP, but I'm not seeing
> it so far. Does this platform/build HAVE_SETNS? (src/include/pcp/config.h)
>
The platform I was seeing this on has HAVE_SETNS, but for some reason
it built _without_ HAVE_SECURE_SOCKETS. No idea why, but it did - probably
a missing ssl or nss library or header or something. Ken, does your OpenSuSE
build HAVE_SECURE_SOCKETS ?
To test the theory that secure sockets are required for container
support, on my RHEL70 platform (that has been working with containers),
I ran the following experiment :
[rhel70]$ ./Makepkgs --with-secure-sockets=0
...
[rhel70]$ grep HAVE_SECURE_SOCKETS pcp-3.10.3/src/include/pcp/config.h
/* #undef HAVE_SECURE_SOCKETS */
... install the just built packages (with --force --nodeps if needed)
and than start up a container:
[rhel70]$ sudo docker run fedora:latest sleep 9999999 &
[rhel70]$ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED
STATUS PORTS NAMES
bdb58746deaf fedora:21 "sleep 9999999" 15 seconds ago
Up 14 seconds berserk_mcclintock
Check we can still connect to pmcd (not asking for secure sockets) :
[rhel70]$ pminfo -h localhost -f hinv.ncpu
hinv.ncpu
value 2
Same again, but this time for the container :
[rhel70]$ pminfo -h localhost --container bdb58746deaf -f hinv.ncpu
pminfo: Cannot connect to PMCD on host "localhost": Operation not supported
Here's the -DTRACE,DESPERATE trace :
[rhel70]$ pminfo DCONTEXT,DESPERATE -h localhost --container bdb58746deaf -f
hinv.ncpu
pminfo: Cannot connect to PMCD on host "localhost": Operation not supported
[mgoodwin@ocean pcp]$ pminfo -DCONTEXT,DESPERATE -h localhost --container
bdb58746deaf -f hinv.ncpu
__pmConnectPMCD: trying __pmAuxConnectPMCDPort(localhost, 44321) ...
auxconnect.c:__pmGetAddrInfo(localhost) -> (null)
__pmSetSocketIPC: fd=3
IPC table fd(PDU version):
auxconnect.c:__pmHostEntFree(hostent=0x7c73d0) name=(nil) ((null))
addresses=0x7c84c0
__pmDecodeXtendError: got error PDU (code=0, datum=1073742082, version=2)
__pmSetVersionIPC: fd=3 version=2
IPC table fd(PDU version): 3(2,1)
__pmSendCreds: #0 = 1020040
__pmConnectPMCD(localhost): pmcd connection port=44321 failed: Operation not
supported
pmNewContext(1, localhost) -> -95, curcontext=-1
pminfo: Cannot connect to PMCD on host "localhost": Operation not supported
Nathan, there seems to be a path thru __pmConnectPMCD where the containers
feature requires the secure sockets feature. Is this expected?
Cheers
-- Mark
From nscott@redhat.com Mon Mar 2 01:39:10 2015
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Changes committed to git://git.pcp.io/pcp.git dev
Nathan Scott (2):
qa: add missing no-python notrun check to 904
qa: ensure 904 output consistent between python versions
qa/904 | 3 +++
qa/904.out | 6 ++++--
qa/src/test_pmnswalk.python | 8 +++++---
3 files changed, 12 insertions(+), 5 deletions(-)
From nscott@redhat.com Mon Mar 2 01:41:10 2015
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From: Nathan Scott
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----- Original Message -----
> On 03/02/2015 12:23 PM, Nathan Scott wrote:
> [...]
> Nathan, there seems to be a path thru __pmConnectPMCD where the containers
> feature requires the secure sockets feature. Is this expected?
Definitely not expected! Thanks for the analysis, Mark - will look into
this immediately, I should be able to reproduce it now.
cheers.
--
Nathan
From nscott@redhat.com Mon Mar 2 03:10:58 2015
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From: Nathan Scott
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Subject: Re: Build failure in dev - papi-related
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Just confirming that reverting 67bec4f21ddc resolves the problem,
as one would expect.
cheers.
----- Original Message -----
> Everything was good on Friday when I left :) ... but no longer.
> (this was with a working pcp-pmda-papi build too, and using the
> papi-5.2.0-5.fc20.x86_64 version of PAPI from Fedora20).
>
> $ ./Makepkgs
>
> == Cleaning build tree for packaging build
> Wrote: /source/git/pcp/build/tar/pcp-3.10.3.src.tar.gz
>
> == Preparing fresh build tree for packaging build
>
> == Configuring pcp, log is in /source/git/pcp/Logs/pcp (--prefix=/usr
> --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
> --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
> --libexecdir=/usr/libexec --localstatedir=/var --sharedstatedir=/var/lib
> --mandir=/usr/share/man)
>
> Configure failed, see log in /source/git/pcp/Logs/pcp
> configure: error: Package requirements (check) were not met:
>
> No package 'check' found
>
> Consider adjusting the PKG_CONFIG_PATH environment variable if you
> installed software in a non-standard prefix.
>
> Alternatively, you may set the environment variables papi_CFLAGS
> and papi_LIBS to avoid the need to call pkg-config.
> See the pkg-config man page for more details.
>
>
> --
> Nathan
>
From nscott@redhat.com Mon Mar 2 03:38:16 2015
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From: Nathan Scott
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Subject: Re: [pcp] problem with containers support and qa/977
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Got it - fix pushed in, can you verify the fix for me Mark? Certainly
fixes the problem here, and yep definitely accidental fallout from the
secure sockets option. +1 to fixing that code in the way Dave & I have
discussed in the past, so that NSS/SSL is dynamically loaded. Would've
avoided the conditional alternate code-path that caused this problem.
Thanks!
----- Original Message -----
> ----- Original Message -----
> > On 03/02/2015 12:23 PM, Nathan Scott wrote:
> > [...]
> > Nathan, there seems to be a path thru __pmConnectPMCD where the containers
> > feature requires the secure sockets feature. Is this expected?
>
> Definitely not expected! Thanks for the analysis, Mark - will look into
> this immediately, I should be able to reproduce it now.
>
> cheers.
>
> --
> Nathan
>
From nscott@redhat.com Mon Mar 2 03:39:15 2015
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Changes committed to git://git.pcp.io/pcp.git dev
Nathan Scott (1):
libpcp: fix non-secure-socket builds requesting containers
src/libpcp/src/auxconnect.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
From michele@redhat.com Mon Mar 2 04:13:26 2015
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Date: Mon, 2 Mar 2015 11:13:18 +0100
From: Michele Baldessari
To: Nathan Scott
Cc: pcp
Subject: Re: pcp2pdf under python3
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Hi Nathan,
On Sun, Mar 01, 2015 at 08:04:34PM -0500, Nathan Scott wrote:
> I had a quick look at python3 support in pcp2pdf, since that
> is freshly in my mind from last week, and came across a few
> issues so far. The biggest being this one, affecting code in
> __main__.py:
>
> http://stackoverflow.com/questions/14087598/python-3-3-importerror-no-module-named-configparser
>
> There's also a syntax error at stats.py graph_wrapper function
> due to the extra parenthesis, not sure if that was intentional
> to ensure a tuple is passed perhaps? ... (if that is what that
> does?) Anyway, it seems in python3 you can't do that anymore.
Ah righto, yeah it is wanted because multiprocess would take a function
with a single argument. I'll work around that somehow or see if python3
has different magic to do it.
> Attached patch resolves a few, but I wasn't sure how you want
> to go about solving that configparser issue so will leave it
> here for now. Patch attached includes a few tweaks to github
> URLs as well (plus some little things I may have sent earlier
> but aren't merged - or maybe I forgot to send 'em through? --
> they're from awhile back, anyway).
Thanks a lot! I will fix this up. I totally did not notice
that we already have a python3-pcp package ;) Good stuff!
Btw. I will be around tonight for the release if needed
regards,
Michele
--
Michele Baldessari Sr. Technical Account Manager
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Office: +39 02 36047647 Mobile: +39 342 7382225
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From fche@redhat.com Mon Mar 2 06:24:49 2015
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Nathan Scott writes:
> Just confirming that reverting 67bec4f21ddc resolves the problem,
> as one would expect.
Ah, sorry about that. This should fix it:
diff --git a/configure b/configure
index 548dac3785a2..13782735d9c2 100755
--- a/configure
+++ b/configure
@@ -10095,7 +10095,7 @@ pmda_papi=false
savedLIBS=$LIBS
case "$do_papi" in
- yes|no) ;;
+ yes|no|check) ;;
*/*) PAPI_ROOTDIR=$do_papi;
CFLAGS="-I$PAPI_ROOTDIR/include"
LDFLAGS="-L$PAPI_ROOTDIR/lib" ;;
diff --git a/configure.ac b/configure.ac
index 36b158dc6e51..8190efcb4b49 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1302,7 +1302,7 @@ AS_IF([test "x$do_papi" != "xno"], [
savedLIBS=$LIBS
case "$do_papi" in
- yes|no) ;;
+ yes|no|check) ;;
*/*) PAPI_ROOTDIR=$do_papi;
CFLAGS="-I$PAPI_ROOTDIR/include"
LDFLAGS="-L$PAPI_ROOTDIR/lib" ;;
From lberk@redhat.com Mon Mar 2 09:04:28 2015
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Mon, 2 Mar 2015 10:04:22 -0500
From: Lukas Berk
To: fche@redhat.com (Frank Ch. Eigler)
Cc: Nathan Scott , pcp
Subject: Re: [pcp] Build failure in dev - papi-related
References: <1897805648.17901907.1425265337299.JavaMail.zimbra@redhat.com>
<1927510337.18116487.1425287447652.JavaMail.zimbra@redhat.com>
X-ASG-Orig-Subj: Re: [pcp] Build failure in dev - papi-related
Date: Mon, 02 Mar 2015 10:04:22 -0500
In-Reply-To: (Frank Ch. Eigler's message of "Mon,
02 Mar 2015 07:24:36 -0500")
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Hi,
fche@redhat.com (Frank Ch. Eigler) writes:
[...]
> Ah, sorry about that. This should fix it:
This fixes the build for me as well.
Cheers,
Lukas
>
> diff --git a/configure b/configure
> index 548dac3785a2..13782735d9c2 100755
> --- a/configure
> +++ b/configure
> @@ -10095,7 +10095,7 @@ pmda_papi=false
> savedLIBS=$LIBS
>
> case "$do_papi" in
> - yes|no) ;;
> + yes|no|check) ;;
> */*) PAPI_ROOTDIR=$do_papi;
> CFLAGS="-I$PAPI_ROOTDIR/include"
> LDFLAGS="-L$PAPI_ROOTDIR/lib" ;;
> diff --git a/configure.ac b/configure.ac
> index 36b158dc6e51..8190efcb4b49 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -1302,7 +1302,7 @@ AS_IF([test "x$do_papi" != "xno"], [
> savedLIBS=$LIBS
>
> case "$do_papi" in
> - yes|no) ;;
> + yes|no|check) ;;
> */*) PAPI_ROOTDIR=$do_papi;
> CFLAGS="-I$PAPI_ROOTDIR/include"
> LDFLAGS="-L$PAPI_ROOTDIR/lib" ;;
>
From brolley@redhat.com Mon Mar 2 09:59:29 2015
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Subject: pcp-webjs Changes (was: PCP Release 3.10.3 Scheduled for Monday March
2, 2015)
References: <54EF449B.6060506@redhat.com> <54F0D3E2.9020207@redhat.com>
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Hi Frank,
It turns out that the pcp-webjs repository is not part of the PCP
project per-Se and so, if you are able, you can push changes there as
you see fit. No coordination with the pending release 3.10.3 is required.
Dave
On 02/27/2015 04:26 PM, Frank Ch. Eigler wrote:
> Dave Brolley writes:
>
>> [...] If you have changes pending that have not been pushed, please
>> let me know immediately so that they can be considered for
>> inclusion. [...]
> And the proposed commits for the webjs repository are also in
> pcpfans.git, branch fche/webjs.
>
>
> commit 5e473bcddf7ce87f598c7bcbd584c1d28d92d0f5
> Author: Frank Ch. Eigler
> Date: Fri Feb 27 16:22:14 2015 -0500
>
> grafana 1.9.1 default-dashboards & index reference
>
> Now pmwebd users have a choice of old & new.
>
> commit 5c4972c951b58674684d7a4c53b55111b093ba11
> Author: Frank Ch. Eigler
> Date: Fri Feb 27 14:03:50 2015 -0500
>
> pcp-graphite-grafana defaults
>
> commit 9ae306134e3244855a61cbf7d8af7b878141fc8d
> Author: Frank Ch. Eigler
> Date: Fri Feb 27 13:28:04 2015 -0500
>
> import grafana 1.9.1
>
> commit 68d76fee943d57e25295d6f84197553a44bc675f
> Author: Frank Ch. Eigler
> Date: Fri Feb 27 13:26:28 2015 -0500
>
> grafana dashboards: add a memory available/used row
>
> Also, enforce UTC timezone throghout, json_reformat, dos2unix the lot.
From fche@redhat.com Mon Mar 2 10:15:40 2015
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To: Dave Brolley
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Subject: Re: pcp-webjs Changes (was: PCP Release 3.10.3 Scheduled for Monday March 2, 2015)
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Hi -
> It turns out that the pcp-webjs repository is not part of the PCP
> project per-Se and so, if you are able, you can push changes there
> as you see fit. [...]
Unfortunately, I do not (any longer?) have access. Now what?
- FChE
From brolley@redhat.com Mon Mar 2 10:28:54 2015
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On 03/02/2015 11:15 AM, Frank Ch. Eigler wrote:
> Hi -
>
>> It turns out that the pcp-webjs repository is not part of the PCP
>> project per-Se and so, if you are able, you can push changes there
>> as you see fit. [...]
> Unfortunately, I do not (any longer?) have access. Now what?
>
I'll try.
From brolley@redhat.com Mon Mar 2 10:44:33 2015
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On 03/02/2015 11:30 AM, Dave Brolley wrote:
> On 03/02/2015 11:15 AM, Frank Ch. Eigler wrote:
>> Hi -
>>
>>> It turns out that the pcp-webjs repository is not part of the PCP
>>> project per-Se and so, if you are able, you can push changes there
>>> as you see fit. [...]
>> Unfortunately, I do not (any longer?) have access. Now what?
>>
> I'll try.
I can't do it either. Looks like possibly a directory permissions
problem in my case:
drwxrwsr-x 8 pcp pcp 4096 2014-12-18 23:49 pcp.git
drwxr-sr-x 7 pcp pcp 4096 2014-10-27 00:54 pcp-webjs.git
The pcp group lacks write permissions for pcp-webjs.git.
Dave
From fche@redhat.com Mon Mar 2 10:58:42 2015
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From: "Frank Ch. Eigler"
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Subject: Re: [pcp] pcp-webjs Changes
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Hi -
On Mon, Mar 02, 2015 at 11:45:54AM -0500, Dave Brolley wrote:
> >>>It turns out that the pcp-webjs repository is not part of the PCP
> >>>project per-Se and so, if you are able, you can push changes there
> >>>as you see fit. [...]
> >>Unfortunately, I do not (any longer?) have access. Now what?
> [...]
> I can't do it either. Looks like possibly a directory permissions
> problem in my case [...]
OK, thanks for trying. We could perhaps work around this halfbaked
repo by switching to pcpfans, and replacing all the pcp.git
spec/script references to git|ftp/oss.sgi/pcp-webjs.git.
- FChE
From brolley@redhat.com Mon Mar 2 11:42:09 2015
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From: Dave Brolley
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Changes committed to git://git.pcp.io/pcp.git dev
Frank Ch. Eigler (1):
configure: handle 'check' as a value for $do_papi.
configure | 2 +-
configure.ac | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
From brolley@redhat.com Mon Mar 2 11:48:17 2015
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I will begin building/packaging the release in about an hour, after
lunch. I am not aware of any pending changes at this time.
Dave
From michele@acksyn.org Mon Mar 2 13:41:42 2015
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Date: Mon, 2 Mar 2015 20:41:35 +0100
From: Michele Baldessari
To: Nathan Scott
Cc: pcp
Subject: Re: [pcp] pcp2pdf under python3
Message-ID: <20150302194134.GA683@marquez.int.rhx>
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Hi Nathan,
On Sun, Mar 01, 2015 at 08:04:34PM -0500, Nathan Scott wrote:
> I had a quick look at python3 support in pcp2pdf, since that
> is freshly in my mind from last week, and came across a few
> issues so far.
I have now fixed all the issues related to python3. I also
made packages for F21 and rawhide: https://copr.fedoraproject.org/coprs/mbaldessari/pcp2pdf/
Thanks again!
Michele
--
Michele Baldessari
C2A5 9DA3 9961 4FFB E01B D0BC DDD4 DCCB 7515 5C6D
From kenj@internode.on.net Mon Mar 2 14:44:04 2015
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From: Ken McDonell
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Subject: FC19 et al QA failures ...
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I'm seeing this appearing in the output files ...
send-mail: Cannot open mail:25
A quick google search suggests this is a systemic issue, e.g. http://unix.stackexchange.com/questions/73083/set-up-local-mail-delivery-to-user-from-cron-script
And indeed
# yum remove ssmtp
changes the "problem" to
/usr/sbin/sendmail: No such file or directory
. . . message not sent.
but this does also remove "smartmontools" which seems like it may be a problem.
So I reinstalled ssmtp and smartmontools.
What is the recommended way to address this?
Note that installing postfix (with no configuration) has no impact ... the original problem persists.
On the other hand, removing postfix and installing sendmail resolves the issue.
From fche@redhat.com Mon Mar 2 15:36:31 2015
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To: pcp developers
Subject: Re: multithreading bottleneck: pdubuf.c
References: <20150302015436.GB21203@redhat.com>
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From: fche@redhat.com (Frank Ch. Eigler)
Date: Mon, 02 Mar 2015 16:36:19 -0500
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> [...]
> Some systemtapping on a busy pmwebd shows a ginormous amount of
> traffic flowing through libpcp/src/pdubuf.c, [...]
> I'm thinking of redoing this module as a (binary tree)
> [...]
It turns out a first cut of this wasn't too hard; see (RFC only)
pcpfans.git fche/multithread
commit 2aa8ca43c1a873c2ccd85d3890d3dc671d2b78d3
Author: Frank Ch. Eigler
Date: Mon Mar 2 15:55:02 2015 -0500
libpcp pdubuf: rewrite using binary trees
The former single pdubuf-tracking structure with linear searches was a
serious buttleneck in multithreaded clients such as pmwebd running
graphite graphing jobs. This version does away with that, and instead
uses balanced binary trees provided by libc (SVr4, POSIX.1-2001)
storing nonoverlapping segments. This makes pin/unpin lookups
considerably faster. The nodes in the tree are malloc'd with buffers
immediately adjacent, which reduces malloc traffic/fragmentation.
There is no free/pin-list kept any more, which seems to speed things
up further.
Single-threaded clients do not appear to suffer for it (as confirmed
with perf-stat reports of larger archive-processing tasks);
multithreaded clients seem to benefit; the code is also simpler. It
seems to be a win-win.
The proof is in the pudding: over a relatively large dataset, a random
pmwebd graphite view ran thusly with single-threaded old code (line up
the metric-count rows for comparisons):
[] digested 1688 metrics, in 43325.5ms
[] digested 199 metrics, in 2028.53ms
[] digested 231 metrics, in 9893.74ms
[] digested 390 metrics, in 4028.63ms
[] digested 398 metrics, in 3815.58ms
-M8-threaded with previous libpcp
[] digested 1688 metrics, in 51467.3ms
[] digested 199 metrics, in 1795.19ms
[] digested 231 metrics, in 4131.55ms
[] digested 390 metrics, in 2215.19ms
[] digested 398 metrics, in 1375.55ms
-M8-threaded with this libpcp
[] digested 1688 metrics, in 27656ms
[] digested 199 metrics, in 1232.82ms
[] digested 231 metrics, in 4859.89ms
[] digested 390 metrics, in 2052.02ms
[] digested 398 metrics, in 1715.61ms
There is considerable variation from run-to-run (and an anomaly or
tw), but the trend is consistently that the benefits increase with
larger parallelism & job-size.
From nscott@redhat.com Mon Mar 2 15:55:40 2015
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Date: Mon, 2 Mar 2015 16:55:34 -0500 (EST)
From: Nathan Scott
Reply-To: Nathan Scott
To: Ken McDonell
Cc: PCP
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Hi Ken,
----- Original Message -----
> [...]
> What is the recommended way to address this?
>
(I'm using sendmail here, FWLIW)
> Note that installing postfix (with no configuration) has no impact ... the
> original problem persists.
>
> On the other hand, removing postfix and installing sendmail resolves the
> issue.
I wonder if we should rethink our strategy of sending mail when unresolvable
problems occur? An alternative might be to create a logfile with (sometimes
large) body of the mail in a relevant location, then log a one-line summary
to syslog? (and do away with all reliance on sending mail)?
In recent production environments I've worked, this'd have been a preferable
strategy in general, as it would've fitted in more neatly with the central
logging and alerting systems in use. But, YMMV, maybe other folks prefer to
get mail for this kind of thing still... not sure.
cheers.
--
Nathan
From nscott@redhat.com Mon Mar 2 16:03:17 2015
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Subject: Re: Build failure in dev - papi-related
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----- Original Message -----
> Nathan Scott writes:
>
> > Just confirming that reverting 67bec4f21ddc resolves the problem,
> > as one would expect.
>
> Ah, sorry about that. This should fix it:
>
Yep, works for me - thanks.
--
Nathan
From nscott@redhat.com Mon Mar 2 16:10:42 2015
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Subject: Re: pcp2pdf under python3
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----- Original Message -----
> [...]
> Thanks a lot! I will fix this up. I totally did not notice
> that we already have a python3-pcp package ;) Good stuff!
No problem. Lots of fixes and improvements in that package in (currently
releasing) pcp-3.10.3, BTW.
> Btw. I will be around tonight for the release if needed
Thanks! Any interest in taking on copr builds for other PCP components?
(we could add repo links onto the website for easier installation for the
punters from Fedora/RHEL/CentOS then?).
cheers.
--
Nathan
From nscott@redhat.com Mon Mar 2 16:19:51 2015
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From: Nathan Scott
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