Messages in this thread | | | Date | Mon, 9 Sep 2013 16:03:39 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCHv2 00/25] perf tool: Add support for multiple data file storage |
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On Mon, Sep 09, 2013 at 01:55:18PM +0200, Peter Zijlstra wrote: > On Mon, Sep 09, 2013 at 01:36:41PM +0200, Jiri Olsa wrote: > > On Mon, Sep 09, 2013 at 01:17:49PM +0200, Peter Zijlstra wrote: > > > On Sun, Sep 01, 2013 at 12:36:11PM +0200, Jiri Olsa wrote: > > This patchset is actually doing 3 essential things: > > 1) adds new perf data format version (v3) > > 2) adds class/object to handle perf data file > > 3) adds record '-M size' option > > So the -M thing is where the multiple files stuff comes from, right? > What's the purpose of this? Why would I care how big these files get, > surely filesystems handle 4g+ files these days.
my usage currently is to having this running during the day: (well whenever I remember to run it.. ;-) )
[jolsa@krava perf]$ sudo ./perf record -g -M 1m -a
and checking report when the system or app get stuck
with multiple files I can just easily (or automaticaly) remove old ones without restarting session
> > > > The only reason I wanted this is so that each thread can write its own > > > data. The current one file thing is an immense bottle-neck for big > > > machines. > > > > > > > I haven't considered the thread based storage yet, but I > > think having the simplified format and centralized file > > handling will only help. > > Please do consider it now, it'd suck to have to change the file format > thing yet again.
ook
> > With both per-thread and size limited your filename generation needs > some extra bits I suppose.
yep, and probably some merging at the end
jirka
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