>>Sounds good. Any reason for not switching to tcmalloc by default in PVE?
I'm currently benching it inside qemu, but I don't see too much improvements
I'm around 30000iops by virtio disk, glibc or tcmalloc. (don't known if jemmaloc works fine with qemu)
I don't known if all this memory allocations call could be reduce in librbd/librados ?
----- Mail original -----
De: "Stefan Priebe" <s.priebe@xxxxxxxxxxxx>
À: "aderumier" <aderumier@xxxxxxxxx>, "Milosz Tanski" <milosz@xxxxxxxxx>
Cc: "cbt" <cbt@xxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>
Envoyé: Mardi 12 Mai 2015 08:12:08
Objet: Re: [Cbt] client fio-rbd benchmark : debian wheezy vs ubuntu vivid : big difference
Am 12.05.2015 um 02:34 schrieb Alexandre DERUMIER:
>>> ou can try it and see if it'll make a difference. Set LD_PRELOAD to
>>> include the so of jemalloc / tcmalloc before starting FIO. Like this:
>>>
>>> $ export LD_PRELOAD=${JEMALLOC_PATH}/lib/libjemalloc.so.1
>>> $ ./run_test.sh
>
> Thanks it's working.
>
> Seem that jemmaloc with fio-rbd give 17% iops improvement and reduce latencies and cpu usage !
>
> results with 1 numjob:
>
> glibc : iops=36668 usr=62.23%, sys=12.13%
> libtcmalloc : iops=36105 usr=63.54%, sys=8.45%
> jemalloc: iops=43181 usr=60.91%, sys=10.51%
>
>
> (with 10numjobs, i'm around 240k iops with jemalloc vs 220k iops with glibc/tcmalloc)
>
>
> I just found a qemu git a patch to enable tcmalloc
> http://git.qemu.org/?p=qemu.git;a=commitdiff;h=2847b46958ab0bd604e1b3fcafba0f5ba4375833
> I'll try to test it to see if it's help
Sounds good. Any reason for not switching to tcmalloc by default in PVE?
Stefan
>
>
>
>
>
>
> fio results
> ------------
>
> glibc
> -----
> Jobs: 1 (f=1): [r(1)] [100.0% done] [123.9MB/0KB/0KB /s] [31.8K/0/0 iops] [eta 00m:00s]
> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=7239: Tue May 12 02:05:46 2015
> read : io=30000MB, bw=146675KB/s, iops=36668, runt=209443msec
> slat (usec): min=8, max=1245, avg=26.07, stdev=13.99
> clat (usec): min=107, max=4752, avg=525.40, stdev=207.46
> lat (usec): min=126, max=4767, avg=551.47, stdev=208.27
> clat percentiles (usec):
> | 1.00th=[ 171], 5.00th=[ 215], 10.00th=[ 253], 20.00th=[ 322],
> | 30.00th=[ 386], 40.00th=[ 450], 50.00th=[ 516], 60.00th=[ 588],
> | 70.00th=[ 652], 80.00th=[ 716], 90.00th=[ 796], 95.00th=[ 868],
> | 99.00th=[ 996], 99.50th=[ 1048], 99.90th=[ 1192], 99.95th=[ 1240],
> | 99.99th=[ 1368]
> bw (KB /s): min=112328, max=176848, per=100.00%, avg=146768.86, stdev=12974.09
> lat (usec) : 250=9.61%, 500=37.58%, 750=37.25%, 1000=14.60%
> lat (msec) : 2=0.96%, 4=0.01%, 10=0.01%
> cpu : usr=62.23%, sys=12.13%, ctx=10008821, majf=0, minf=1348
> IO depths : 1=0.1%, 2=0.1%, 4=3.0%, 8=28.8%, 16=64.2%, 32=4.0%, >=64=0.0%
> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
> complete : 0=0.0%, 4=96.1%, 8=0.1%, 16=0.1%, 32=3.9%, 64=0.0%, >=64=0.0%
> issued : total=r=7680000/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
> latency : target=0, window=0, percentile=100.00%, depth=32
>
> Run status group 0 (all jobs):
> READ: io=30000MB, aggrb=146674KB/s, minb=146674KB/s, maxb=146674KB/s, mint=209443msec, maxt=209443msec
>
> Disk stats (read/write):
> sdb: ios=0/22, merge=0/13, ticks=0/0, in_queue=0, util=0.00%
>
>
> jemmaloc
> --------
> Jobs: 1 (f=1): [r(1)] [100.0% done] [165.4MB/0KB/0KB /s] [42.3K/0/0 iops] [eta 00m:00s]
> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=7137: Tue May 12 02:01:25 2015
> read : io=30000MB, bw=172726KB/s, iops=43181, runt=177854msec
> slat (usec): min=6, max=563, avg=22.28, stdev=14.68
> clat (usec): min=95, max=3559, avg=456.29, stdev=168.37
> lat (usec): min=110, max=3579, avg=478.56, stdev=169.06
> clat percentiles (usec):
> | 1.00th=[ 161], 5.00th=[ 201], 10.00th=[ 233], 20.00th=[ 290],
> | 30.00th=[ 346], 40.00th=[ 402], 50.00th=[ 454], 60.00th=[ 506],
> | 70.00th=[ 556], 80.00th=[ 612], 90.00th=[ 676], 95.00th=[ 732],
> | 99.00th=[ 844], 99.50th=[ 900], 99.90th=[ 1020], 99.95th=[ 1064],
> | 99.99th=[ 1192]
> bw (KB /s): min=129936, max=199712, per=100.00%, avg=172822.83, stdev=11812.99
> lat (usec) : 100=0.01%, 250=12.77%, 500=45.87%, 750=37.60%, 1000=3.62%
> lat (msec) : 2=0.13%, 4=0.01%
> cpu : usr=60.91%, sys=10.51%, ctx=9329053, majf=0, minf=1687
> IO depths : 1=0.1%, 2=0.1%, 4=1.8%, 8=26.4%, 16=67.5%, 32=4.2%, >=64=0.0%
> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
> complete : 0=0.0%, 4=95.9%, 8=0.1%, 16=0.1%, 32=4.0%, 64=0.0%, >=64=0.0%
> issued : total=r=7680000/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
> latency : target=0, window=0, percentile=100.00%, depth=32
>
> Run status group 0 (all jobs):
> READ: io=30000MB, aggrb=172725KB/s, minb=172725KB/s, maxb=172725KB/s, mint=177854msec, maxt=177854msec
>
> Disk stats (read/write):
> sdb: ios=0/0, merge=0/0, ticks=0/0, in_queue=0, util=0.00%
>
>
> libtcmalloc
> ------------
> rbd engine: RBD version: 0.1.10
> Jobs: 1 (f=1): [r(1)] [100.0% done] [140.1MB/0KB/0KB /s] [35.9K/0/0 iops] [eta 00m:00s]
> rbd_iodepth32-test: (groupid=0, jobs=1): err= 0: pid=7039: Tue May 12 01:57:41 2015
> read : io=30000MB, bw=144423KB/s, iops=36105, runt=212708msec
> slat (usec): min=10, max=803, avg=26.65, stdev=17.68
> clat (usec): min=54, max=5052, avg=530.82, stdev=216.05
> lat (usec): min=114, max=5531, avg=557.46, stdev=217.22
> clat percentiles (usec):
> | 1.00th=[ 169], 5.00th=[ 213], 10.00th=[ 251], 20.00th=[ 322],
> | 30.00th=[ 386], 40.00th=[ 454], 50.00th=[ 524], 60.00th=[ 596],
> | 70.00th=[ 660], 80.00th=[ 724], 90.00th=[ 804], 95.00th=[ 876],
> | 99.00th=[ 1048], 99.50th=[ 1128], 99.90th=[ 1336], 99.95th=[ 1464],
> | 99.99th=[ 2256]
> bw (KB /s): min=60416, max=161496, per=100.00%, avg=144529.50, stdev=10827.54
> lat (usec) : 100=0.01%, 250=9.88%, 500=36.69%, 750=36.97%, 1000=14.88%
> lat (msec) : 2=1.57%, 4=0.01%, 10=0.01%
> cpu : usr=63.54%, sys=8.45%, ctx=9209514, majf=0, minf=2120
> IO depths : 1=0.1%, 2=0.1%, 4=3.0%, 8=28.9%, 16=64.0%, 32=4.0%, >=64=0.0%
> submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
> complete : 0=0.0%, 4=96.1%, 8=0.1%, 16=0.1%, 32=3.8%, 64=0.0%, >=64=0.0%
> issued : total=r=7680000/w=0/d=0, short=r=0/w=0/d=0, drop=r=0/w=0/d=0
> latency : target=0, window=0, percentile=100.00%, depth=32
>
>
>
>
>
> ----- Mail original -----
> De: "Milosz Tanski" <milosz@xxxxxxxxx>
> À: "aderumier" <aderumier@xxxxxxxxx>
> Cc: "Stefan Priebe" <s.priebe@xxxxxxxxxxxx>, "cbt" <cbt@xxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>
> Envoyé: Lundi 11 Mai 2015 23:38:51
> Objet: Re: [Cbt] client fio-rbd benchmark : debian wheezy vs ubuntu vivid : big difference
>
> On Mon, May 11, 2015 at 10:20 AM, Alexandre DERUMIER
> <aderumier@xxxxxxxxx> wrote:
>>>> That's pretty interesting. I wasn't aware that there were performance
>>>> optimisations in glibc.
>>>>
>>>> As you have a test setup. Is it possible to install jessie libc on wheezy?
>>
>> mmm, I can try that. Not sure it'll work.
>>
>>
>> BTW, librbd cpu usage is always 3x-4x more than KRBD.
>> a lot of cpu is used from malloc/free. It could be great to optimise that.
>>
>> I don't known if jemmaloc or tcmalloc could be used, like for osd daemons ?
>
> You can try it and see if it'll make a difference. Set LD_PRELOAD to
> include the so of jemalloc / tcmalloc before starting FIO. Like this:
>
> $ export LD_PRELOAD=${JEMALLOC_PATH}/lib/libjemalloc.so.1
> $ ./run_test.sh
>
> As a matter of policy, libraries shouldn't force a particular malloc
> implementation on the users of a particular library. It might go
> against the user's wishes, not to mention what conflicts would happen
> if one library wanted / needed jamalloc while another one wanted /
> needed tcmalloc.
>
>>
>>
>> Reducing cpu usage could improve a lot qemu performance, as qemu use only 1 thread by disk.
>>
>>
>>
>> ----- Mail original -----
>> De: "Stefan Priebe" <s.priebe@xxxxxxxxxxxx>
>> À: "aderumier" <aderumier@xxxxxxxxx>, "cbt" <cbt@xxxxxxxx>, "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>
>> Envoyé: Lundi 11 Mai 2015 12:30:03
>> Objet: Re: [Cbt] client fio-rbd benchmark : debian wheezy vs ubuntu vivid : big difference
>>
>> Am 11.05.2015 um 07:53 schrieb Alexandre DERUMIER:
>>> Seem that's is ok too on debian jessie (with an extra boost with rbd_cache true)
>>>
>>> Maybe is it related to old glibc on debian wheezy ?
>>
>> That's pretty interesting. I wasn't aware that there were performance
>> optimisations in glibc.
>>
>> As you have a test setup. Is it possible to install jessie libc on wheezy?
>>
>> Stefan
>>
>>
>>>
>>> debian jessie: rbd_cache=false : iops=202985 : %Cpu(s): 21,9 us, 9,5 sy, 0,0 ni, 66,1 id, 0,0 wa, 0,0 hi, 2,6 si, 0,0 st
>>> debian jessie: rbd_cache=true : iops=215290 : %Cpu(s): 27,9 us, 10,8 sy, 0,0 ni, 58,8 id, 0,0 wa, 0,0 hi, 2,6 si, 0,0 st
>>>
>>>
>>> ubuntu vivid : rbd_cache=false : iops=201089 %Cpu(s): 21,3 us, 12,8 sy, 0,0 ni, 61,8 id, 0,0 wa, 0,0 hi, 4,1 si, 0,0 st
>>> ubuntu vivid : rbd_cache=true : iops=197549 %Cpu(s): 27,2 us, 15,3 sy, 0,0 ni, 53,2 id, 0,0 wa, 0,0 hi, 4,2 si, 0,0 st
>>> debian wheezy : rbd_cache=false: iops=161272 %Cpu(s): 28.4 us, 15.4 sy, 0.0 ni, 52.8 id, 0.0 wa, 0.0 hi, 3.4 si, 0.0 st
>>> debian wheezy : rbd_cache=true : iops=135893 %Cpu(s): 30.0 us, 15.5 sy, 0.0 ni, 51.5 id, 0.0 wa, 0.0 hi, 3.0 si, 0.0 st
>>>
>>>
>>>
>>> jessie perf report
>>> ------------------
>>> + 9,18% 3,75% fio libc-2.19.so [.] malloc
>>> + 6,76% 5,70% fio libc-2.19.so [.] _int_malloc
>>> + 5,83% 5,64% fio libc-2.19.so [.] _int_free
>>> + 5,11% 0,15% fio libpthread-2.19.so [.] __libc_recv
>>> + 4,81% 4,81% swapper [kernel.kallsyms] [k] intel_idle
>>> + 3,72% 0,37% fio libpthread-2.19.so [.] pthread_cond_broadcast@@GLIBC_2.3.2
>>> + 3,41% 0,04% fio libpthread-2.19.so [.] 0x000000000000efad
>>> + 3,31% 0,54% fio libpthread-2.19.so [.] pthread_cond_wait@@GLIBC_2.3.2
>>> + 3,19% 0,09% fio libpthread-2.19.so [.] __lll_unlock_wake
>>> + 2,52% 0,00% fio librados.so.2.0.0 [.] ceph::buffer::create_aligned(unsigned int, unsigned int)
>>> + 2,09% 0,08% fio libc-2.19.so [.] __posix_memalign
>>> + 2,04% 0,26% fio libpthread-2.19.so [.] __lll_lock_wait
>>> + 2,02% 0,13% fio libc-2.19.so [.] _mid_memalign
>>> + 1,95% 1,91% fio libc-2.19.so [.] __memcpy_sse2_unaligned
>>> + 1,88% 0,08% fio libc-2.19.so [.] _int_memalign
>>> + 1,88% 0,00% fio libc-2.19.so [.] __clone
>>> + 1,88% 0,00% fio libpthread-2.19.so [.] start_thread
>>> + 1,88% 0,12% fio fio [.] thread_main
>>> + 1,37% 1,37% swapper [kernel.kallsyms] [k] native_write_msr_safe
>>> + 1,29% 0,05% fio libc-2.19.so [.] __lll_unlock_wake_private
>>> + 1,24% 1,24% fio libpthread-2.19.so [.] pthread_mutex_trylock
>>> + 1,24% 0,29% fio libc-2.19.so [.] __lll_lock_wait_private
>>> + 1,19% 0,21% fio librbd.so.1.0.0 [.] std::_List_base<ceph::buffer::ptr, std::allocator<ceph::buffer::ptr> >::_M_clear()
>>> + 1,19% 1,19% fio libc-2.19.so [.] free
>>> + 1,18% 1,18% fio libc-2.19.so [.] malloc_consolidate
>>> + 1,14% 1,14% fio [kernel.kallsyms] [k] get_futex_key_refs.isra.13
>>> + 1,10% 1,10% fio [kernel.kallsyms] [k] __schedule
>>> + 1,00% 0,28% fio librados.so.2.0.0 [.] ceph::buffer::list::append(char const*, unsigned int)
>>> + 0,96% 0,00% fio librbd.so.1.0.0 [.] 0x000000000005b2e7
>>> + 0,96% 0,96% fio [kernel.kallsyms] [k] _raw_spin_lock
>>> + 0,92% 0,21% fio librados.so.2.0.0 [.] ceph::buffer::list::append(ceph::buffer::ptr const&, unsigned int, unsigned int)
>>> + 0,91% 0,00% fio librados.so.2.0.0 [.] 0x000000000006e6c0
>>> + 0,90% 0,90% swapper [kernel.kallsyms] [k] __switch_to
>>> + 0,89% 0,01% fio librbd.so.1.0.0 [.] 0x00000000000ce1f1
>>> + 0,89% 0,89% swapper [kernel.kallsyms] [k] cpu_startup_entry
>>> + 0,87% 0,01% fio librados.so.2.0.0 [.] 0x00000000002e3ff1
>>> + 0,86% 0,00% fio libc-2.19.so [.] 0x00000000000dd50d
>>> + 0,85% 0,85% fio [kernel.kallsyms] [k] try_to_wake_up
>>> + 0,83% 0,83% swapper [kernel.kallsyms] [k] __schedule
>>> + 0,82% 0,82% fio [kernel.kallsyms] [k] copy_user_enhanced_fast_string
>>> + 0,81% 0,00% fio librados.so.2.0.0 [.] 0x0000000000137abc
>>> + 0,80% 0,80% swapper [kernel.kallsyms] [k] menu_select
>>> + 0,75% 0,75% fio [kernel.kallsyms] [k] _raw_spin_lock_bh
>>> + 0,75% 0,75% fio [kernel.kallsyms] [k] futex_wake
>>> + 0,75% 0,75% fio libpthread-2.19.so [.] __pthread_mutex_unlock_usercnt
>>> + 0,73% 0,73% fio [kernel.kallsyms] [k] __switch_to
>>> + 0,70% 0,70% fio libstdc++.so.6.0.20 [.] std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)
>>> + 0,70% 0,36% fio librados.so.2.0.0 [.] ceph::buffer::list::iterator::copy(unsigned int, char*)
>>> + 0,70% 0,23% fio fio [.] get_io_u
>>> + 0,67% 0,67% fio [kernel.kallsyms] [k] finish_task_switch
>>> + 0,67% 0,32% fio libpthread-2.19.so [.] pthread_rwlock_unlock
>>> + 0,67% 0,00% fio librados.so.2.0.0 [.] 0x00000000000cea98
>>> + 0,64% 0,00% fio librados.so.2.0.0 [.] 0x00000000002e3f87
>>> + 0,63% 0,63% fio [kernel.kallsyms] [k] futex_wait_setup
>>> + 0,62% 0,62% swapper [kernel.kallsyms] [k] enqueue_task_fair
>>>
>>
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