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Bug #59472 increase AIO requests per IO thread limit to 256 from 32

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rb://566
approved by: Sunny

When using native aio on linux each IO helper thread should be able to
handle upto 256 IO requests. The number 256 is the same which is used
for simulated aio as well. In case of windows where we also use native
aio this limit is 32 because of OS constraints. It seems that we are
using the limit of 32 for all the platforms where we are using native
aio. The fix is to use 256 on all platforms except windows (when native
aio is enabled on windows)
This commit is contained in:
Inaam Rana 2011-02-07 18:43:00 -05:00
commit 41ddf242e3
1 changed files with 8 additions and 5 deletions
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13
storage/innobase/srv/srv0start.c
View file

@ -1327,13 +1327,16 @@ innobase_start_or_create_for_mysql(void)
ut_a(srv_n_file_io_threads <= SRV_MAX_N_IO_THREADS);
/* TODO: Investigate if SRV_N_PENDING_IOS_PER_THREAD (32) limit
still applies to windows. */
if (!srv_use_native_aio) {
io_limit = 8 * SRV_N_PENDING_IOS_PER_THREAD;
} else {
io_limit = 8 * SRV_N_PENDING_IOS_PER_THREAD;
/* On Windows when using native aio the number of aio requests
that a thread can handle at a given time is limited to 32
i.e.: SRV_N_PENDING_IOS_PER_THREAD */
# ifdef __WIN__
if (srv_use_native_aio) {
io_limit = SRV_N_PENDING_IOS_PER_THREAD;
}
# endif /* __WIN__ */
os_aio_init(io_limit,
srv_n_read_io_threads,