Bug #1517
closedone second delay after stat() / Linux epoll / lighttpd-r2025
Description
Most of the time, there is one second delay between stat() is called and
some action is visible to client (e.g. 404 error written).
Attached strace files:
slow-with-stat_cache.txt:
server.stat-cache-engine = "simple"
server.max-stat-threads = 32
slow-no-stat_cache.txt:
no stat-cache.
Both have:
server.event-handler = "linux-sysepoll"
Files
Updated by Safari over 16 years ago
If I make N (N > 1) requests in parallel, the (N - 1) first work OK, but the last one is delayed by one second. Some queue management bug? Debug prints for queues are non-existent, queue loop is pretty complex... someone want to help me with this?
Updated by Safari over 16 years ago
Found the bug. SIGUSR1 hack is not working as hoped: epoll_wait is not always interrupted with EINTR. I nuked SIGUSR1 and replaced with reading/writing a pipe.
There may be other ways to solve this problem, too.
You are welcome.
Updated by Safari over 16 years ago
This patch also fixes the performance problem with gthread-aio.
I get now 180 MB/s instead of < 1 MB/s.
See #1186
Updated by Anonymous over 16 years ago
new patch for rev 2169? gthread-aio is really slow
Updated by peto about 16 years ago
This issue still exists in r2294, and also makes AIO unusable in FBSD. This patch works (with a couple obvious lines added to base.h that were missing). Please apply this before the final 1.5 release; AIO is the biggest 1.5 feature and this is a critical fix.
Updated by stbuehler about 16 years ago
- Status changed from New to Fixed
- % Done changed from 0 to 100
Applied in changeset r2342.
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