brahms@spp3.UUCP (Bradley S. Brahms) (01/27/86)
[}{]
At some point in the future, I plan to upgrade my 7300 to 2meg. I would
like to know what type of difference in response to expect when I do the
upgrade? Currently, when doing compilations with c, the 7300 seems to
do a lot of swapping. I suspect that most of this will go away with
2meg. Thanx for the comments.
-- Brad Brahms
usenet: {decvax,ucbvax,ihnp4}!trwrb!trwspp!brahms
arpa: Brahms@usc-eclcdov@imagen.UUCP (Dov Isaacs) (01/31/86)
> [}{] > At some point in the future, I plan to upgrade my 7300 to 2meg. I would > like to know what type of difference in response to expect when I do the > upgrade? Currently, when doing compilations with c, the 7300 seems to > do a lot of swapping. I suspect that most of this will go away with > 2meg. Thanx for the comments. > > -- Brad Brahms > usenet: {decvax,ucbvax,ihnp4}!trwrb!trwspp!brahms > arpa: Brahms@usc-eclc Same difference as a Convergent MiniFrame upgrade from 1 to 2 Megabytes. You are experiencing thrashing of memory pages - the system does not use swapping, it has virtual memory. Threshold for reasonable performance is at least 1.5 megabytes!
vedm@hoqam.UUCP (BEATTIE) (02/03/86)
> You are experiencing thrashing of memory pages - the system does not use > swapping, it has virtual memory. Please explain the distinction between "thrashing" and "swapping". Tom. ...!{decvax | ucbvax}!ihnp4!hoqax!twb
jsdy@hadron.UUCP (02/05/86)
In article <217@hoqam.UUCP> vedm@hoqam.UUCP (BEATTIE) writes: > [ attribution MISSING! ] >> You are experiencing thrashing of memory pages - the system does not use >> swapping, it has virtual memory. >Please explain the distinction between "thrashing" and "swapping". Not a "distinction" but an attribute. Swapping is putting a whole program out at a time from primary storage to secondary storage. Paging, on the other hand, is putting a part out at a time: the advantage is that you can have the active part of more programs in main memory at a time (theoretically). When the system becomes so swap-bound or page-bound that it is spending an inordinate amount of time doing I/O for these functions, it is called "thrashing." ("Inordinate" can be 20-60%, depending on other factors.) Most paging machines still swap some of the time. I haven't looked at s5r2.0 hard enough yet to determine whether this is true of it. -- Joe Yao hadron!jsdy@seismo.{CSS.GOV,ARPA,UUCP}