Some more results, using a larger number of processes and io depths. A repeat of the tests from friday, with added depth 20000 for syslet and libaio:
Engine Depth Processes Bw (MiB/sec) ---------------------------------------------------- libaio 1 1 602 syslet 1 1 759 sync 1 1 776 libaio 32 1 832 syslet 32 1 898 libaio 20000 1 581 syslet 20000 1 609 syslet still on top. Measuring O_DIRECT reads (of 4kb size) on ramfs with 100 processes each with a depth of 200, reading a per-process private file of 10mb (need to fit in my ram...) 10 times each. IOW, doing 10,000MiB of IO in total: Engine Depth Processes Bw (MiB/sec) ---------------------------------------------------- libaio 200 100 1488 syslet 200 100 1714 Results are stable to within approx +/- 10MiB/sec. The syslet case completes a whole second faster than libaio (~6 vs ~7 seconds). Testing was done with fio HEAD eb7c8ae27bc301b77490b3586dd5ccab7c95880a, and it uses the v4 patch series. Engine Depth Processes Bw (MiB/sec) ---------------------------------------------------- libaio 200 100 1488 syslet 200 100 1714 sync 200 100 1843 -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
