<DIV>This is a direct copy from doing 'man vmstat' on my rh9 box. Hope it helps you.</DIV>
<DIV> </DIV>
<DIV>FIELD DESCRIPTIONS<BR> Procs<BR> r: The number of processes waiting for run time.<BR> b: The number of processes in uninterruptable sleep.<BR> w: The number of processes swapped out but otherwise runnable. This<BR> field is calculated, but Linux never desperation swaps.</DIV>
<DIV> Memory<BR> swpd: the amount of virtual memory used (kB).<BR> free: the amount of idle memory (kB).<BR> buff: the amount of memory used as buffers (kB).</DIV>
<DIV> Swap<BR> si: Amount of memory swapped in from disk (kB/s).<BR> so: Amount of memory swapped to disk (kB/s).</DIV>
<DIV> IO<BR> bi: Blocks sent to a block device (blocks/s).<BR> bo: Blocks received from a block device (blocks/s).</DIV>
<DIV> System<BR> in: The number of interrupts per second, including the clock.<BR> cs: The number of context switches per second.</DIV>
<DIV> CPU<BR> These are percentages of total CPU time.<BR> us: user time<BR> sy: system time<BR> id: idle time</DIV>
<DIV> </DIV>
<DIV><BR><BR><B><I>Michael Neikes <michael@neikes-net.de></I></B> wrote:</DIV>
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<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Hi list,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">perhaps there is a misunderstanding because of my english knowlede.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Perhaps it is also a difference between MoH and CoD.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I run vmstats and do only see si and so (perhaps the s for suse!?), but I think it’s the same as pi and po.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">I have got a zero in there, so I am not swapping, right?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">“</SPAN></FONT><SPAN lang=EN-GB>doesnt take up any more RAM<BR>to run multiple installations”<FONT color=purple><SPAN style="COLOR: purple">-></SPAN></FONT><FONT color=navy><SPAN style="COLOR: navy"> does not seems to work within MoH.<o:p></o:p></SPAN></FONT></SPAN></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">I run multiple installations with all their pathes, etc.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">e.g. every server takes 10% of RAM.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">When I run one installation multiple times, I do also have multiple processess á 10% of RAM,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">So it seems they are not “sharing” the same code of RAM.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">Is it an issue from MoH?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">Sorry for a MoH issue at this list.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN lang=EN-GB style="FONT-SIZE: 12pt; COLOR: navy">Michael<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN lang=EN-GB style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Von:</SPAN></FONT></B><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Orr, Roland Cadet [mailto:orr@cadetmail.uscga.edu] <BR><B><SPAN style="FONT-WEIGHT: bold">Gesendet:</SPAN></B> Freitag, 14. Mai 2004 06:17<BR><B><SPAN style="FONT-WEIGHT: bold">An:</SPAN></B> <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:PersonName w:st="on">cod@icculus.org</st1:PersonName><BR><B><SPAN style="FONT-WEIGHT: bold">Betreff:</SPAN></B> RE: [cod] Multiple Servers on one box and PB</SPAN></FONT><o:p></o:p></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></P>
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<P class=MsoNormal><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'">fascinating!!! thank you for that helpful insight!!! (feel free to send more emails on the intricate innerworkings of linux)</SPAN></FONT><o:p></o:p></P></DIV>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Mark J. DeFilippis [mailto:defilm@acm.org]<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, May 13, 2004 10:45 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> <st1:PersonName w:st="on">cod@icculus.org</st1:PersonName><BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [cod] Multiple Servers on one box and PB</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">At 03:03 PM 5/10/2004, Andrew Urm wrote:<BR><BR><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Additional server instances don't take up more RAM? Really? Or were you saying something else?<BR><BR>Andrew<BR><BR>luke@techfreak.org wrote:<BR><BR><BR><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">Of course, there is a more 'elegant' way, but the guy is trying to<BR>get his feet wet here. So, I suggested an easy method.<BR>Also, I have run test after test and it doesnt take up any more RAM<BR>to run multiple installations, as opposed to using base_path. Or are<BR>you taking about using disk space?<BR>Luke<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt"><BR><BR>Additional instances do not take up more ram because the first instance<BR>pulls the executable page code in to swap space in Unix/Linux. If you<BR>have enough RAM, (and that is critical, or it Unix/Linux will need to page<BR>swap, and there goes the lag game.. This falls on basic design theory for<BR>Unix... You can never have enough ram. You always want to have enough RAM<BR>to run your programs in ram, or you will page swap. Page swap = slow,<BR>without getting in to the nasty details). How can I tell if I am page swapping?<BR><BR>run " vmstat". Check the man page for vmstat. You will see a PI and PO,<BR>these should be zero. If not, you are swapping in pages of code to execute.<BR>Add more ram, and you may have to relink the kernel, but most Unix/Linux<BR>version support up to 4GB or more for 32 bit.<BR><BR>The way it works is this.... Code for each game will execute in
ram, and<BR>share the page, but each will get their OWN data area's for Heap and<BR>Stack.<BR><BR>However, if one process (Game running) attempts to write to a code<BR>page, Linux will do a "Copy on Fork()". This is viewable in vmstat<BR>as well. Basically it means that "A copy using the shared code attempted<BR>to modify it, so it make a separate copy for the process that attempted to<BR>write to the code base".<BR><BR>Since this does not happen in COD, or most processes for that matter,<BR>they all share the same single image in Swap to load to ram, and the<BR>same single image of code in RAM. If you were to put the processes<BR>in debug, and look at the registers, you would see the code segment<BR>registers are all the same, but the data pointer registers are all different.<BR><BR>Check out vmstat, and read the man page. It is worth your time.<BR>It will give you some good insight on how the resources are allocated...<BR><BR>Nice huh? Someday Windows will really
work like that, or maybe<BR>it will replace windows? {;-))<BR><BR>MFrag<BR>{TRv}Team-Ravage<BR>aka. Mark J. DeFilippis, Ph. D EE<BR><BR><BR><BR><o:p></o:p></SPAN></FONT></P><X-SIGSEP>
<P style="MARGIN-BOTTOM: 12pt"></X-SIGSEP><TT><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt">-------------------------------------------------------------------------------</SPAN></FONT></TT><FONT face="Courier New" size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Courier New'"><BR><TT><FONT face="Courier New">Mark J. DeFilippis defilm@acm.org</FONT></TT><BR><TT><FONT face="Courier New"> defilm@ieee.org</FONT></TT><BR><BR></SPAN></FONT><o:p></o:p></P></BLOCKQUOTE></DIV></BLOCKQUOTE>