[Perfparse-devel-int] Re: [Perfparse-users] perfparsed & CPU usage

[Tim W. <tim...@gm...>]

Yves,

Recompiling with the log_source_nonblock(i)  line commented out does
not change anything. The CPU still sky-rockets, and the 4 lines still
show up (a gazillion times) in strace output.

:(

Tim


On Fri, 26 Nov 2004 15:56:42 +0100 (CET), Yves <yme...@pe...> wrote:
> 
> > Yves,
> >
> > I've done an strace, results are attached. Changing &tm to NULL did
> > not change anything.
> 
> Well, here is what your perfparsed does when doing nothing :
> 
> select(6, [4 5], NULL, NULL, NULL)      = 1 (in [4])
> rt_sigprocmask(SIG_BLOCK, [INT TERM], [], 8) = 0
> read(4, "", 10)                         = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> wait4(-1, NULL, WNOHANG, NULL)          = -1 ECHILD (No child processes)
> 
> In other words, there is always something to read on the 4th file descriptor (1st line),
> even if we see on the 3rd line that it reads nothing.
> 
> There is an additionnal test that you could maybe do, still in log_reader.c. You can
> find in open_log_source a big test :
> if(!strcmp(filename,"-")) {
>    ...
> } else if(filename[0] == '>') {
>    ...
> } else if(filename[0] == '|') {
>    ...
>    log_source_nonblock(i);
>    ...
> } else {
>    ...
> }
> 
> Could you comment that log_source_nonblock(i), and only that one ?
> I hope this is the fix. Otherwise, I will have to find why, when there is nothing to
> read on the pipe, why it considers there is something to read anyways.
> 
> Note : per...@li... is the mailing-list for the core developers,
> including Ben. If you don't mind, answer with that list in CC :)
> 
> 
> 
> Yves
> 
> --
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> 
>