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author | Eric Wong <normalperson@yhbt.net> | 2010-08-30 23:25:59 -0700 |
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committer | Eric Wong <normalperson@yhbt.net> | 2010-08-30 23:30:05 -0700 |
commit | f9a7a19a361fd674bab4e2df7e0897015528bba7 (patch) | |
tree | ed3c35480cd587fe744cf6bf21d8005616b8ab7f | |
parent | da272fc48ffaa808456fe94dd7a3e01bc9799832 (diff) | |
download | unicorn-f9a7a19a361fd674bab4e2df7e0897015528bba7.tar.gz |
Large buffers can hurt as well as help. And the difference in real apps that do a lot of things other than I/O often makes it not worth it.
-rw-r--r-- | TUNING | 8 |
1 files changed, 7 insertions, 1 deletions
@@ -22,7 +22,13 @@ See Unicorn::Configurator for details on the config file format. listeners under Linux 2.6 because auto-tuning is enabled. UNIX domain sockets do not have auto-tuning buffer sizes; so increasing those will allow syscalls and task switches to be saved for larger requests - and responses. + and responses. If your app only generates small responses or expects + small requests, you may shrink the buffer sizes to save memory, too. + +* Having socket buffers too large can also be detrimental or have + little effect. Huge buffers can put more pressure on the allocator + and may also thrash CPU caches, cancelling out performance gains + one would normally expect. * Setting "preload_app true" can allow copy-on-write-friendly GC to be used to save memory. It will probably not work out of the box with |