Severe performance degradation on Linux

[Jens Tröger]

Thank you, Maarten.

I tried to upload the callgrind data, but the email was rejected due to
its size.  Glad you can reproduce the slowness!

Now the question is: what's to cause of the socket slowness, compared to
the pipe performance?  Based on yesterday's findings, this might not be
a LO issue afterall.  Connecting to LO through a pipe gives me the same
performance (and faster) that I have on my Mac.  It's the socket connect
which is so slow.  See here for more data:

  https://forum.openoffice.org/en/forum/viewtopic.php?f=20&t=74332&p=336914#p336975

The question lingers: why is socket connect on Linux so tremendously
slower than on the Mac...

  http://superuser.com/questions/860321/linux-localhost-sockets-painfully-slower-than-on-mac

Jens


On Mon, Jan 05, 2015 at 06:36:47PM +0100, Maarten Hoes wrote:
>    Hi,
>    For what its worth, i can easily reproduce the script takes fairly long
>    (about ~50 seconds on my vm's) to complete on both Ubuntu 14.04 and
>    Fedora 21, both with the distro supplied binaries and a recent master.
>    I ran the script using strace -f. It shows a lot of calls on futex(
>    'FUTEX_WAIT_PRIVATE'), though im not sure how relevant that may be. I
>    attached the strace output.
>    - Maarten

-- 
Jens Tröger
http://savage.light-speed.de/