Also, for what it's worth, I did analysis during recovery (though not
with different transparent hugepage settings). You can see it on slide
#13 here:
http://nhm.ceph.com/mark_nelson_ceph_tech_talk.odp
On 09/08/2015 06:49 PM, Mark Nelson wrote:
Excellent investigation Alexandre! Have you noticed any performance
difference with tp=never?
Mark
On 09/08/2015 06:33 PM, Alexandre DERUMIER wrote:
I have done small benchmark with tcmalloc and jemalloc, transparent
hugepage=always|never.
for tcmalloc, they are no difference.
but for jemalloc, the difference is huge (around 25% lower with
tp=never).
jemmaloc 4.6.0+tp=never vs tcmalloc use 10% more RSS memory
jemmaloc 4.0+tp=never almost use same RSS memory than tcmalloc !
I don't have monitored memory usage in recovery, but I think it should
help too.
tcmalloc 2.1 tp=always
-------------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 67746 120 1.0 1531220 671152 ? Ssl 01:18 0:43
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 67764 144 1.0 1570256 711232 ? Ssl 01:18 0:51
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
root 68363 220 0.9 1522292 655888 ? Ssl 01:19 0:46
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 68381 261 1.0 1563396 702500 ? Ssl 01:19 0:55
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
root 68963 228 1.0 1519240 666196 ? Ssl 01:20 0:31
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 68981 268 1.0 1564452 694352 ? Ssl 01:20 0:37
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
tcmalloc 2.1 tp=never
-----------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 69560 144 1.0 1544968 677584 ? Ssl 01:21 0:20
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 69578 167 1.0 1568620 704456 ? Ssl 01:21 0:23
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
root 70156 164 0.9 1519680 649776 ? Ssl 01:21 0:16
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 70174 214 1.0 1559772 692828 ? Ssl 01:21 0:19
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
root 70757 202 0.9 1520376 650572 ? Ssl 01:22 0:20
/usr/bin/ceph-osd --cluster=ceph -i 0 -f
root 70775 236 1.0 1560644 694088 ? Ssl 01:22 0:23
/usr/bin/ceph-osd --cluster=ceph -i 1 -f
jemalloc 3.6 tp = always
------------------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 92005 46.1 1.4 2033864 967512 ? Ssl 01:00 0:04
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 92027 45.5 1.4 2021624 963536 ? Ssl 01:00 0:04
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 92703 191 1.5 2138724 1002376 ? Ssl 01:02 1:16
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 92721 183 1.5 2126228 986448 ? Ssl 01:02 1:13
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 93366 258 1.4 2139052 984132 ? Ssl 01:03 1:09
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 93384 250 1.5 2126244 990348 ? Ssl 01:03 1:07
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
jemalloc 3.6 tp = never
-----------------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 93990 238 1.1 2105812 762628 ? Ssl 01:04 1:16
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 94033 263 1.1 2118288 781768 ? Ssl 01:04 1:18
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 94656 266 1.1 2139096 781392 ? Ssl 01:05 0:58
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 94674 257 1.1 2126316 760632 ? Ssl 01:05 0:56
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 95317 297 1.1 2135044 780532 ? Ssl 01:06 0:35
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 95335 284 1.1 2112016 760972 ? Ssl 01:06 0:34
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
jemalloc 4.0 tp = always
------------------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 100275 198 1.3 1784520 880288 ? Ssl 01:14 0:45
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 100320 239 1.1 1793184 760824 ? Ssl 01:14 0:47
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 100897 200 1.3 1765780 891256 ? Ssl 01:15 0:50
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 100942 245 1.1 1817436 746956 ? Ssl 01:15 0:53
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 101517 196 1.3 1769904 877132 ? Ssl 01:16 0:33
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 101562 258 1.1 1805172 746532 ? Ssl 01:16 0:36
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
jemalloc 4.0 tp = never
-----------------------
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 98362 87.8 1.0 1841748 678848 ? Ssl 01:10 0:53
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 98405 97.0 1.0 1846328 699620 ? Ssl 01:10 0:56
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 99018 233 1.0 1812580 698848 ? Ssl 01:12 0:30
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 99036 226 1.0 1822344 677420 ? Ssl 01:12 0:29
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
root 99666 281 1.0 1814640 696420 ? Ssl 01:13 0:33
/usr/bin/ceph-osd --cluster=ceph -i 5 -f
root 99684 266 1.0 1835676 676768 ? Ssl 01:13 0:32
/usr/bin/ceph-osd --cluster=ceph -i 4 -f
----- Mail original -----
De: "aderumier" <aderumier@xxxxxxxxx>
À: "ceph-devel" <ceph-devel@xxxxxxxxxxxxxxx>, "ceph-users"
<ceph-users@xxxxxxxxxxxxxx>
Envoyé: Mardi 8 Septembre 2015 21:42:35
Objet: [ceph-users] jemalloc and transparent hugepage
Hi,
I have found an interesting article about jemalloc and transparent
hugepages
https://www.digitalocean.com/company/blog/transparent-huge-pages-and-alternative-memory-allocators/
Could be great to see if disable transparent hugepage help to have
lower jemalloc memory usage.
Regards,
Alexandre
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