-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello psyche-list, I've got a large data compilation application. It takes in a very large quantity of text data and produces a resulting binary file that is about 1.3 GB. In the mean time, it holds on the order of 2 GB of data in memory while operating on it to produce the output file. Under Red Hat 7.2 with the 2.4.9-31 kernel, my data compiling machine require about 6 hours and 50 minutes to do this operation. Under Red Hat 8.0 with the 2.4.18-18.8.0 kernel, the same machine requires just over 2 DAYS to perform the same operation. According to /proc/meminfo, the machine has a total memory of 791080960 bytes. So, I am not surprised that I need to do a fair amount of paging. In addition to a 2 GB swap partition, I created a pair of 2 GB swap files, to handle any overload. But, as I recall, this was the case under 7.2 as well. I have not made any substantial changes to the code that performs the data compile. I was wondering whether there had been some significant change in the memory management system or something else that would account for this. Also, I just noticed that another RH 8.0 system in my office, set up by someone else, has a 4 GB swap partition. The mkswap(8) man page still says that the maximum useful size for the i386 architecture is about 2 GB. Is the man page out-of-date, or are we wasting 2 GB of disk space? The /proc/meminfo and /proc/swaps seem to be indicating that all of it is there and available. ??? Thanks! Ron. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.8 Comment: Until recently, the last PGP with full source disclosure. iQA/AwUBPgdPGm8pw+2/9pUJEQLZYgCg1wUvgRzrG9UCz1yV1Q5gKOCDfIkAoPYM pmYoALZqUdL4PLzkd1G4CIc0 =lUYW -----END PGP SIGNATURE----- -- Psyche-list mailing list Psyche-list@redhat.com https://listman.redhat.com/mailman/listinfo/psyche-list
