<!DOCTYPE html PUBLIC "-//w3c//dtd html 4.0 transitional//en"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> <meta name="GENERATOR" content="Mozilla/4.73 [en] (WinNT; I) [Netscape]"> <title>Argyll Performance Tuning</title> </head> <body> <h2> <u>Performance Tuning</u></h2> <br> Some operations in Argyll can be particularly slow, so it is worth examining ways of<br> improving performance.<br> <br> <h3>Creating Profiles:</h3> (To be added).<br> <br> See also "Creating Device Links" for how to increase the reverse cache size, if creating the B2A table is particularly slow.<br> <br> <h3>Creating Device Links:</h3> Just as in creating the B2A tables of profiles, the execution time of creating device links is often dominated by the inversion of forward color lookup values. A memory cache is employed to speed up this operation, by keeping computed values in case they can be used more than once. The amount of memory used for caching these values is pre-set within the inversion code, and on typical problems<br> uses 50-100 Mbytes of memory. If you have more memory available in your system, you can try increasing the cache size<br> (particularly if you get a "Warning - Reverse Cell Cache exhausted, processing in chunks" message during processing).<br> <br> This can be done by setting an environment variable ARGYLL_REV_CACHE_MULT to a number greater than 1. This<br> will multiply the size of the cache by that number (i.e. 2 would double the cache size).<br> <br> If you do this, take care that you don't make the cache too big, and cause your system to run out of memory.<br> <br> To do this in a Windows DOS shell, either use set, e.g.;<br> <br> set ARGYLL_REV_CACHE_MULT=2<br> <br> which will set the value for that session, or set it in<br> <br> Control Panel->System->Advanced->Environment Variables..<br> <br> in either user or system variables.<br> <br> For OS X or Linux, the exact procedure will depend on the shell you are running, but<br> is usually something like:<br> <br> export ARGYLL_REV_CACHE_MULT=2<br> or<br> set ARGYLL_REV_CACHE_MULT=2<br> or<br> ARGYLL_REV_CACHE_MULT=2<br> <br> and may need separately exporting, something like:<br> <br> export ARGYLL_REV_CACHE_MULT<br> <br> Generally it should be configured in the shell start-up script, if you want the setting to be used<br> for every session.<br> <br> <br> </body> </html>
