Re: [PATCHv2 00/25] perf tool: Add support for multiple data filestorage

From: Adrian Hunter
Date: Tue Sep 10 2013 - 02:47:57 EST


On 09/09/13 14:17, Peter Zijlstra wrote:
> On Sun, Sep 01, 2013 at 12:36:11PM +0200, Jiri Olsa wrote:
>> hi,
>> sending the support for multiple file storage. Initial
>> RFC is here:
>> http://marc.info/?l=linux-kernel&m=137408381902423&w=2
>>
>> v2 changes:
>> - reworked perf mmap size setup to be able to get
>> the mmap size value easily later
>> - added perf.data read/write test for v2 and v3
>> for both endianity
>> - added record '-M time' support
>
> So this 0/n post seems to have forgotten to list the rationale for doing
> all this..
>
> 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.

Do you need multiple files for that? Why not just feed writes to a pool of
threads?

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