[plt-scheme] Re: Appalling performance of DrScheme on Windows

From: Jos Koot (jos.koot at telefonica.net)
Date: Wed Jun 21 10:39:28 EDT 2006

To add my findings: I experience bad response time and performance only 
during and after garbage collection while running out of ram, even when only 
requiring slightly more than available in ram. Typically a garbage 
collection can take several minutes. Even after reducing memory requirements 
and pressing run again, the garbage collector often, but not always, remains 
thrashing whereas my code runs smoothly in the short periods the garbage 
collector is not active. As a remedy, I quit DrScheme and begin a new 
session. In some cases a program eating just a little more memory than 
available in ram may run happily after a fresh start while not running at 
all in a session with trashing history. A number of times I also have 
experienced (with version 301) that after killing and quitting DrScheme and 
checking that no threads were left running, other applications (MsWord, 
OutlookExpress IpSwitch-FTP and Windows itself) remained having memory 
problems, in which case I restart windows. In my case long idle times and 
using help seem not to have any influence.

Windows XP home version 2002
AMD sempron 3100+, 1,81 GHz, 1GB.
DrScheme's version 350 programming environment with MzScheme for language, 
mostly without debugging.

((((lambda(x)((((((x x)x)x)x)x)x))
   (lambda(x)(lambda(y)(x(x y)))))
  (lambda(x)(write x)x))
 "greetings, Jos") 

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