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Date: Fri, 1 Jun 2012 16:25:49 -0500
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From: Mark Felder <feld@feld.me>
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Cc: Ivan Voras <ivoras@freebsd.org>
Subject: Re: SuperPages utilization survey
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[/usr/home/feld]# python spsurvey.py
last pid: 54743;  load averages:  0.28,  0.26,  0.24  up 18+07:41:02     
16:22:45
145 processes: 1 running, 144 sleeping
Mem: 828M Active, 845M Inact, 8517M Wired, 174M Cache, 725M Buf, 265M Free
Swap: 4096M Total, 88M Used, 4008M Free, 2% Inuse

Total accounted memory mappings: 23968 MB (6136043 pages)
Memory in superpages: 12941 MB (14 mappings)
+       pid: 26349 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26351 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26352 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26353 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26374 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26382 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26387 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26388 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 26398 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 44306 (odasrv) start: 801800000 stop: 806000000 (72 MB) tp:  
df path:
+       pid: 44318 (odasrv) start: 801800000 stop: 805c00000 (68 MB) tp:  
df path:
+       pid: 53549 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 53932 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
+       pid: 54515 (postgres) start: 802800000 stop: 8452c6000 (1066 MB)  
tp: ph path:
Eligible mappings not promoted: 413


Yup, seems like Postgres does a good job of using superpages