I have a question about git gc memory usage。
I execute git gc in a git repository, in the information below top,
we can see it uses res 1.5g, Why does it use so much res.
We all know that res does not contain cache. I think git gc should use
cache more.
top - 15:08:50 up 6 days, 23:22, 0 users, load average: 2.11, 2.69, 2.80
Tasks: 8 total, 2 running, 6 sleeping, 0 stopped, 0 zombie
%Cpu(s): 18.9 us, 3.4 sy, 0.0 ni, 74.2 id, 2.7 wa, 0.0 hi, 0.8 si, 0.0 st
MiB Mem : 31346.3 total, 1760.7 free, 23487.9 used, 6097.8 buff/cache
MiB Swap: 0.0 total, 0.0 free, 0.0 used. 5312.7 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
COMMAND
288 root 20 0 2274.2m 1.5g 1.0g R 74.7 4.7 0:14.40
git
1 root 20 0 2.5m 0.1m 0.0m S 0.0 0.0 0:00.01
sh
6 root 20 0 1895.3m 46.5m 9.8m S 0.0 0.1 0:03.88
bin
270 root 20 0 4.1m 3.4m 2.8m S 0.0 0.0 0:00.01
bash
278 root 20 0 4.1m 3.4m 2.9m S 0.0 0.0 0:00.00
bash
283 root 20 0 6.9m 3.1m 2.6m R 0.0 0.0 0:00.00
top
284 root 20 0 6.6m 3.6m 3.3m S 0.0 0.0 0:00.00
git
287 root 20 0 6.6m 3.6m 3.3m S 0.0 0.0 0:00.00 git
I am using git service in docker container(memory limit is 1.5g)
The following is the memory usage in the container before and after
executing git gc.
>From the stat information, the cache is indeed used.
This confuses me why res uses 1.5g in top.
before:
# cat memory.usage_in_bytes
62099456
#cat memory.stat
cache 22167552
rss 39739392
rss_huge 0
shmem 0
mapped_file 8921088
dirty 0
writeback 0
swap 0
workingset_refault_anon 0
workingset_refault_file 23384064
workingset_activate_anon 0
workingset_activate_file 675840
workingset_restore_anon 0
workingset_restore_file 135168
workingset_nodereclaim 0
pgpgin 55803
pgpgout 40624
pgfault 58542
pgmajfault 396
inactive_anon 39739392
active_anon 0
inactive_file 15781888
active_file 6529024
unevictable 0
hierarchical_memory_limit 1610612736
hierarchical_memsw_limit 1610612736
total_cache 22167552
total_rss 39739392
total_rss_huge 0
total_shmem 0
total_mapped_file 8921088
total_dirty 0
total_writeback 0
total_swap 0
total_workingset_refault_anon 0
total_workingset_refault_file 23384064
total_workingset_activate_anon 0
total_workingset_activate_file 675840
total_workingset_restore_anon 0
total_workingset_restore_file 135168
total_workingset_nodereclaim 0
total_pgpgin 55803
total_pgpgout 40624
total_pgfault 58542
total_pgmajfault 396
total_inactive_anon 39739392
total_active_anon 0
total_inactive_file 15781888
total_active_file 6529024
total_unevictable 0
after:
cat memory.usage_in_bytes
1610506240
# cat memory.stat
cache 1391554560
rss 218566656
rss_huge 0
shmem 0
mapped_file 917385216
dirty 135168
writeback 270336
swap 0
workingset_refault_anon 0
workingset_refault_file 1296396288
workingset_activate_anon 0
workingset_activate_file 57040896
workingset_restore_anon 0
workingset_restore_file 135168
workingset_nodereclaim 0
pgpgin 2551098
pgpgout 2157961
pgfault 1536942
pgmajfault 627
inactive_anon 218431488
active_anon 135168
inactive_file 979427328
active_file 412348416
unevictable 0
hierarchical_memory_limit 1610612736
hierarchical_memsw_limit 1610612736
total_cache 1391554560
total_rss 218566656
total_rss_huge 0
total_shmem 0
total_mapped_file 917385216
total_dirty 135168
total_writeback 270336
total_swap 0
total_workingset_refault_anon 0
total_workingset_refault_file 1296396288
total_workingset_activate_anon 0
total_workingset_activate_file 57040896
total_workingset_restore_anon 0
total_workingset_restore_file 135168
total_workingset_nodereclaim 0
total_pgpgin 2551098
total_pgpgout 2157961
total_pgfault 1536942
total_pgmajfault 627
total_inactive_anon 218431488
total_active_anon 135168
total_inactive_file 979427328
total_active_file 412348416
total_unevictable 0
Looking forward to your reply, Thanks very much!
