There is no limit that I know of for PAL other than the system hardware and operating system limitations. When working with very large counter logs, consider using the Relog.exe command-line tool built into the operating system to make the counter log smaller. Relog can filter the 4 GB file to just certain counters, time ranges, or every nth value. Once reduced, the PAL tool should be able to get through the counter log faster. Please keep in mind that already PAL uses Relog to reduce the counter log into a smaller one by filtering it down to only the counters that are in the threshold files active in the analysis.
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