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- Join Date
- Jun 2011
I/O storm causes mq_send to stall
Using 2.6.27, 220.127.116.11 RT, highmem_is_dirtyable = 1, 8gig, no swap, 1 Real time multi-process, muti-thread app which waits on semaphores prior to doing any mq_receives.
a few dd bs=27M count=1 ..... will stall any processes trying to do an mq_send.
I know the disk throughput is very bad 22.9MB/s (R), 18.4 MB/s (W) when using oflag=direct but I don't see where an mq_send would write onto the drive.