It turned out to be the use of %C %l in PatternLayout. Removing that took the per log timings back down to sub-millisecond level. Crazy! I guess I should have heeded the warnings in the JavaDocs. -- View this message in context: http://www.nabble.com/Log4j-1.2.9%2C-64-bit%2C-Websphere-Performance-Problems-tf2088247.html#a7265030 Sent from the Log4j - Users mailing list archive at Nabble.com.
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