Mustafa Gultekin's Tips

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Here are some efficiency tips from Mustafa Gultekin

Subject: Mustafa Gultekin's OS/2 Tips

  • Some clarifications on performance boosting:

If you have more than 6 megabytes of RAM, OS/2 in general works better with HPFS file system. With proper cache size you increase the performance by 150% over FAT file system for I/O intensive applications -also for loading programs etc. If the hard disk is formatted as HPFS OS/2 will put in your CONFIG.SYS:

   IFS=C:›OS2›HPFS.IFS /CACHE:nnn /CRECL:4 /AUTOCHECK:C

assuming your drive is "C". nnn is the cache size. Default is about 5% of total RAM memory. for 8M system it should be around 384 but no more than 512. for 16M, I am using 1024 (1M). I don't think that more than 1.5M helps at all. AUTOCHECK:C tells OS/2 to run CHKDSK on drive C before the Work shell is loaded.(You cannot run CHKDSK from the desktop. It will tell you that the file system is bad etc.) Errors will be corrected at this time. Errors usually caused by programs terminating with files open or turning the system off without "shutdown" procedure. You can add other drives as well ie Autocheck:CD etc.

   run=c:›os2›cache.exe /layz=on

*  will start the HPFS caching.  It is active cache both read &
   write layz=on  ===>   data etc. written to disk when CPU is
   idle.  you can increase it depending on how frequent etc. but
   defaults seems to be OK.

    DISKCACHE=nnn,LW

 *  is for FAT file system only. If you have all HPFS system
    delete it from config.sys.  Caching floppies will not help.
    nnn is the size.  LW is for Lazy Write.


 *  FILES=nn is good only for DOS programs.  If you are using
    Windows under OS/2 bump it to 60.  Else make it ????.


 *  BUFFERS=50  For OS/2.  I found 50 to work better than the          .
    default (30).

 *  MENMAN=SWAP,PROTECT  this is the default with OS/2 2.0.            .
    Leave it as it is.

 *  For those using HPFS I strongly recommend disk utilities by
    GammaTech, Inc (405) 359-1219.  Similar to Norton for DOS.         f
    Has alot of nice features & only reliable way to recover files
    etc.  Excellent user support (I can vouch for that). 32 bit
    version is beta test & should be out soon.

    (PS: OS/2 2.0 can address 4G in Virtual but SAS running under
     OS/2 2.0 can "only" address 1G in Virtual, that will change
     with SAS 6.08.)

Cheers, Mustafa Gultekin