Here's also a good reference to the different (and to some, surprising) memory things going on with 32-bit stuff on Windows. It talks about both 4GT, PAE and the /LARGEADDRESSAWARE linker option that some use - and the impact on system resources. http://msdn.microsoft.com/en-us/library/aa366778.aspx
AFAIK Rom is right about those limits being per-process. -- Janus On 04/25/2012 09:40 PM, Rom Walton wrote: > I'm confused. On Windows, out of the box, the largest amount of memory a > single 32-bit program can allocate is 2GB (3GB with a special boot > option). I believe that is even true on a 64-bit system. > > When your system starts to slow down, is the hard drive busy? It sounds > like what you are experiencing is paging related. > > ----- Rom > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Robert Miles > Sent: Sunday, April 22, 2012 5:36 PM > To: [email protected] > Subject: [boinc_dev] 32-bit workunits under 64-bit Windows > > I've found that my computer tends to slow down user response quite a bit > as the total memory used by 32-bit workunits and other 32-bit programs > approaches 3.5 GB, as I'd expect if all 32-bit programs must fit within > a single 4 GB memoryspace even though the computer has 8 GB of memory > installed. Could you check if this is actually what's happening, > especially on 64-bit versions of Windows with the lower limits on the > total amount of memory they can use? If so, can you find a way to give > each 32-bit workunit a separate 4 GB memoryspace, even if some of it is > shared with other workunits? > > Another possibility is that the portions of the SysWOW64 software needed > to run 32-bit programs is similar in size to the programs that need it, > and therefore you should consider counting SysWOW64 software against the > memory limit allowed for BOINC. Or just count 32-bit workunits twice > against the limit, but 64-bit workunits only once. Or even allow > setting the limit for 32-bit BOINC software and workunits to be lower > than the total amount of memory BOINC can use. > > I'm using 64-bit Windows Vista Home Premium SP2 on that computer. I > haven't found any way to check which if either of the above > possibilities is correct. Currently using BOINC 7.0.25, but I have seen > the same problem on earlier versions back to at least some of the 6.12.* > versions. > > This may be a good reason for the more memory-hungry BOINC projects to > start offering 64-bit applications, even if those 64-bit versions offer > no performance improvements over the 32-bit versions. > _______________________________________________ > boinc_dev mailing list > [email protected] > http://lists.ssl.berkeley.edu/mailman/listinfo/boinc_dev > To unsubscribe, visit the above URL and > (near bottom of page) enter your email address. > _______________________________________________ > boinc_dev mailing list > [email protected] > http://lists.ssl.berkeley.edu/mailman/listinfo/boinc_dev > To unsubscribe, visit the above URL and > (near bottom of page) enter your email address. _______________________________________________ boinc_dev mailing list [email protected] http://lists.ssl.berkeley.edu/mailman/listinfo/boinc_dev To unsubscribe, visit the above URL and (near bottom of page) enter your email address.
