| Memory Management again [message #1668] |
Sun, 19 February 2006 10:34  |
atomic
Messages: 8
Registered: January 2006
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Junior Member |
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Hi,
i read many postings about memory restrictions and guaranteed memory sizes, so i figured out some
values for standard memory sizes.
VMGUARPAGES="32768:2147483647" // 128MB Guaranteed
VMGUARPAGES="65536:2147483647" // 256MB Guaranteed
VMGUARPAGES="131072:2147483647" // 512MB Guaranteed
PRIVVMPAGES="64000:65536" // 256MB Burst
PRIVVMPAGES="128000:131072" // 512MB Burst
PRIVVMPAGES="256000:262140" // 1024MB Burst
Calculation:
VMGUARPAGES and PRIVVMPAGES values are given in memory pages.
One memory page holds 4096Bits or 4Kbyte on a x86-System.
65536 Pages * 4Kbyte = 262144Kbyte = 256Mbyte
Where "guaranteed" means the absolute minimum of available RAM, even if the node is heavily loaded,
and "burst" means the limit of allocatable RAM if there is enough free.
Here is a beancounter output of a VPS with 256Mbyte guaranteed and 1024MByte burst memory:
Version: 2.5
uid resource held maxheld barrier limit failcnt
3: kmemsize 3532503 4198588 16979722 18677694 0
lockedpages 0 0 829 829 0
privvmpages 147040 149045 256000 262140 0
shmpages 11417 11433 31096 31096 0
dummy 0 0 0 0 0
numproc 100 117 800 800 0
physpages 32964 34396 0 2147483647 0
vmguarpages 0 0 65535 2147483647 0
oomguarpages 32964 34396 310967 2147483647 0
numtcpsock 24 25 800 800 0
numflock 7 10 662 728 0
numpty 1 1 80 80 0
numsiginfo 0 2 1024 1024 0
tcpsndbuf 4456 16744 2383107 5659907 0
tcprcvbuf 1204 9576 2383107 5659907 0
othersockbuf 20896 29268 1191553 4468353 0
dgramrcvbuf 0 2228 1191553 1191553 0
numothersock 24 30 800 800 0
dcachesize 322624 332280 3704295 3815424 0
numfile 719 777 6624 6624 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
dummy 0 0 0 0 0
numiptent 10 10 200 200 0
Are these values correct and expedient? What does the value "2147483647" at VMGUARPAGES mean?
2147483647 memory pages are roughly 8192 Gigabytes, is this the maximal allocatable memory size of OpenVZ?
Thanks.
[Updated on: Sun, 19 February 2006 10:49] Report message to a moderator |
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