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[Mark Callaghan <question434586@xxxxxxxxxxxxxxxxxxxxx>]

Question #434586 on sysbench changed:
https://answers.launchpad.net/sysbench/+question/434586

    Status: Open => Answered

Mark Callaghan proposed the following answer:
I have a vague memory of fixing a bug for that and I don't remember whether
the fix was only in my branch or pushed upstream. But that bug was in the
old version of sysbench, before integration with Lua was added. Modern
sysbench is here -> https://github.com/akopytov/sysbench

I think my fix was
http://bazaar.launchpad.net/~mdcallag/sysbench/0.4-dev/revision/76

On Tue, Jan 10, 2017 at 5:57 AM, Nitin Manjalkar <
question434586@xxxxxxxxxxxxxxxxxxxxx> wrote:

> New question #434586 on sysbench:
> https://answers.launchpad.net/sysbench/+question/434586
>
> The test case is like this:
>
> 1) Using sysbench to test the disk throughput.
> 2) Using write back and disk cache with raid 5.
> 3) disks : Intel S3610 X 6
>
>
>
> root@bb-blr-prod-db-01:/cryptfs# sysbench --num-threads=2  --test=fileio
> --file-total-size=350G --file-test-mode=rndrw --init-rng=on -
> -max-time=3600 --max-requests=0 run
> sysbench 0.4.12:  multi-threaded system evaluation benchmark
>
> Running the test with following options:
> Number of threads: 2
> Initializing random number generator from timer.
>
>
> Extra file open flags: 0
> 128 files, 2.7344Gb each
> 350Gb total file size
> Block size 16Kb
> Number of random requests for random IO: 0
> Read/Write ratio for combined random IO test: 1.50
> Periodic FSYNC enabled, calling fsync() each 100 requests.
> Calling fsync() at the end of test, Enabled.
> Using synchronous I/O mode
> Doing random r/w test
> Threads started!
> FATAL: Failed to fsync file! file: 0 errno = 22 ()
> FATAL: Incorrect file discovered in request
> Done.
>
> Operations performed:  2475038 Read, 1650025 Write, 5306656 Other =
> 9431719 Total
> Read 37.766Gb  Written 25.177Gb  Total transferred 62.943Gb  (176.76Mb/sec)
> 11312.79 Requests/sec executed
>
> Test execution summary:
>    total time:                          364.6370s
>    total number of events:              4125063
>    total time taken by event execution: 475.9527
>    per-request statistics:
>         min:                                  0.00ms
>         avg:                                  0.12ms
>         max:                                 12.39ms
>         approx.  95 percentile:               0.53ms
>
> Threads fairness:
>    events (avg/stddev):           2062531.5000/3374.50
>    execution time (avg/stddev):   237.9764/0.04
>
> IOSTAT result:
>
>
> avg-cpu:  %user   %nice %system %iowait  %steal   %idle
>           0.05    0.00    0.98    2.25    0.00   96.72
>
> Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz
> avgqu-sz   await r_await w_await  svctm  %util
> sda               0.00     0.00    0.00    0.00     0.00     0.00
>  0.00     0.00    0.00    0.00    0.00   0.00   0.00
> sdb               0.00     0.00 2775.00 4573.00 54708.00 72828.00
> 34.71     1.90    0.26    0.50    0.11   0.12  90.00
> dm-0              0.00     0.00 2777.00 4569.00 54740.00 72764.00
> 34.71     2.18    0.30    0.55    0.15   0.13  94.00
>
> avg
>
>
>
> My Raid volume config :
>
>
> Advanced Properties
>
> Status
> Name    sdb
> Device Description      Virtual Disk 1 on Integrated RAID Controller 1
> State   Online
> Layout  RAID-5
> Size    7449.38 GB
> Span Depth      1
> Block Size      512 bytes
> Bus Protocol    SATA
> Media Type      SSD
> Operational State       Not Applicable
> Read Policy     Read Ahead
>
> Write Policy    Write Back
> Stripe Size     64K
> Disk Cache Policy       Enabled
> Enhanced Cache  Not Applicable
> Progress        Not Applicable
> Bad Blocks Found        No
> Secured No
> Remaining Redundancy    1
> T10 PI Status   Disabled
>
>
>
> As you saw, the IO is getting choked @ 4500 IOPS  in a long run test. I am
> also not able to run this test with 2 threads.
>
> Pls advise.
>
>
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-- 
Mark Callaghan
mdcallag@xxxxxxxxx

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