| To: | Martin Spier <mspier@xxxxxxxxxxx> |
|---|---|
| Subject: | Re: [pcp] Floating point problem |
| From: | Ken McDonell <kenj@xxxxxxxxxxxxxxxx> |
| Date: | Thu, 31 Jul 2014 10:33:51 +1000 |
| Cc: | Brendan Gregg <bgregg@xxxxxxxxxxx>, pcp@xxxxxxxxxxx, Amer Ather <aather@xxxxxxxxxxx>, Coburn Watson <cwatson@xxxxxxxxxxx> |
| Delivered-to: | pcp@xxxxxxxxxxx |
| In-reply-to: | <CAEp4+dWXWKHWOHD0HACaRnXge7tu8QFGu_R2283EOatLsngXhQ@xxxxxxxxxxxxxx> |
| References: | <CAEp4+dU2kE9JJztBPc=N5oSyoEyBvN5Of19rohC3DxXGeomuRw@xxxxxxxxxxxxxx> <033501cfa8a4$fd091ed0$f71b5c70$@internode.on.net> <CAEp4+dUH6fEQ2E=o5O2q8LKfR2xUypM-AeOwQhWy9sEntvO-AQ@xxxxxxxxxxxxxx> <53D6CE6A.8030309@xxxxxxxxxxxxxxxx> <CAJN39oi=_+NkcsKGcuVdiqT=m8cqoB0wF6v1xakSOPQmYdV4-g@xxxxxxxxxxxxxx> <53D978ED.8010100@xxxxxxxxxxxxxxxx> <CAEp4+dWXWKHWOHD0HACaRnXge7tu8QFGu_R2283EOatLsngXhQ@xxxxxxxxxxxxxx> |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.0 |
On 31/07/14 09:51, Martin Spier wrote: My understanding was that the original metrics, kernel.all.cpu.user and kernel.all.cpu.sys suffered from the same problem. If that's not the case, I completely agree with option 2. I do not believe the underlying metrics have any related semantic issues ... they preserve full precision (as much as you can packing a struct timeval in units of sec + usec into an unsigned 64-bit integer in units of msec), up to integer overflow (which can even be handled algorithmically in the client if you want to add extra credit points). |
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