[Gluster-users] New cluster - first experience

[Pranith Kumar Karampuri]

Will it be possible to get this profile output for a volume without
sharding enabled? If it still doesn't look like the one I gave in the mail
before then we have some debugging to do to find why there are extra
operations we are seeing.

On Tue, Jul 12, 2016 at 9:27 PM, Gandalf Corvotempesta <
gandalf.corvotempesta at gmail.com> wrote:

> Shard was enabled during this test that previously i did other tests with
> shard disabled and speed doesn't change at all.
> Il 12 lug 2016 5:17 PM, "Pranith Kumar Karampuri" <pkarampu at redhat.com>
> ha scritto:
>
>> You got this for single dd workload? Ideally single file dd workload
>> should be dominated by 'WRITE' operation, but seems like it is dominated by
>> too many FINODELK, I see quite a few mknods too. What is puzzling is the
>> number of ENTRYLKs which is of the order of 10k. I see some discussion
>> about enabling sharding, Did you enable sharding by anychance on this
>> volume? Sharding is not yet ready for general purpose workloads. As long as
>> you have single writer workload it is fine. It is very well tested for VM
>> workload.
>>
>>
>> dd workload generally looks like this (dd if=/dev/zero of=a.txt bs=1M
>> count=1000):
>>
>>
>> Brick: localhost.localdomain:/home/gfs/r2_0
>> -------------------------------------------
>> Cumulative Stats:
>>    Block Size:             131072b+              262144b+
>>  No. of Reads:                    0                     0
>> No. of Writes:                 7996                     2
>>  %-latency   Avg-latency   Min-Latency   Max-Latency   No. of
>> calls         Fop
>>  ---------   -----------   -----------   -----------
>> ------------        ----
>>       0.00       0.00 us       0.00 us       0.00 us              1
>> RELEASE
>>       0.00       0.00 us       0.00 us       0.00 us              3
>> RELEASEDIR
>>       0.00      24.00 us      24.00 us      24.00 us              1
>> STATFS
>>       0.00      22.50 us      22.00 us      23.00 us              2
>> ENTRYLK
>>       0.00      28.00 us      27.00 us      29.00 us              2
>> FINODELK
>>       0.00      67.00 us      67.00 us      67.00 us              1
>> GETXATTR
>>       0.00      35.50 us      28.00 us      43.00 us              2
>> FLUSH
>>       0.01     342.00 us     342.00 us     342.00 us              1
>> CREATE
>>       0.10     134.61 us      54.00 us     379.00 us             18
>> FXATTROP
>>       0.23      67.71 us      41.00 us     156.00 us             83
>> LOOKUP
>>      99.65     307.53 us      61.00 us   50633.00 us           7998
>> WRITE
>>
>>
>> On Tue, Jul 12, 2016 at 8:16 PM, Gandalf Corvotempesta <
>> gandalf.corvotempesta at gmail.com> wrote:
>>
>>> 2016-07-12 15:55 GMT+02:00 Pranith Kumar Karampuri <pkarampu at redhat.com
>>> >:
>>> > Could you do the following?
>>> >
>>> > # gluster volume profile <volname> start
>>> > # run dd command
>>> > # gluster volume profile <volname> info >
>>> > /path/to/file/that/you/need/to/send/us.txt
>>>
>>> http://pastebin.com/raw/wcA0i335
>>>
>>
>>
>>
>> --
>> Pranith
>>
>


-- 
Pranith
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