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Date: Tue, 10 Nov 2020 20:44:46 +0100
From: Kurt Roeckx <kurt@roeckx.be>
To: Andres Freund <andres@anarazel.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #16707: Memory leak
Message-ID: <20201110194446.GA566206@roeckx.be>
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I took a copy of /proc/$pid/smaps about 2 hours apart, and a diff
shows:
-5604495f1000-5604886fd000 rw-p 00000000 00:00 0 [heap]
-Size:            1033264 kB
+5604495f1000-56048cc1c000 rw-p 00000000 00:00 0 [heap]
+Size:            1104044 kB
 KernelPageSize:        4 kB
 MMUPageSize:           4 kB
-Rss:             1030296 kB
-Pss:             1030296 kB
+Rss:             1101288 kB
+Pss:             1101288 kB
 Shared_Clean:          0 kB
 Shared_Dirty:          0 kB
 Private_Clean:         0 kB
-Private_Dirty:   1030296 kB
-Referenced:       998992 kB
-Anonymous:       1030296 kB
+Private_Dirty:   1101288 kB
+Referenced:      1067220 kB
+Anonymous:       1101288 kB
 LazyFree:              0 kB
 AnonHugePages:         0 kB
 ShmemPmdMapped:        0 kB

So the heap grew with 70 MB.

The new results from status:
VmPeak:  5928312 kB
VmSize:  5928056 kB
VmLck:         0 kB
VmPin:         0 kB
VmHWM:   5772336 kB
VmRSS:   5772084 kB
RssAnon:         1485980 kB
RssFile:           27472 kB
RssShmem:        4258632 kB
VmData:  1483776 kB
VmStk:       132 kB
VmExe:      5388 kB
VmLib:     68200 kB
VmPTE:     11512 kB
VmSwap:        0 kB
HugetlbPages:          0 kB

Both seem to say that the heap grew with 70 MB in about 2 hours.
With 10 processes growing at this rate, it grows with about 8 GB a
day.


Kurt