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On Solaris 2.5.1, both Guile 1.2 and guile-core-19980514 appear to leak memory in regexp-exec. Below you can see output from ps and (gc-stats) over time 1. Fresh guile-core-19980514 2. After 10000 calls to regexp-exec 3. After 100000 calls to regexp-exec 4. After (expt 10 6) calls to regexp-exec USER PID %CPU %MEM SZ RSS TT S START TIME COMMAND 1 kf 8639 10.2 3.8 2968 2380 pts/4 S 15:40:13 0:06 guile 2 kf 8639 0.1 4.4 3340 2780 pts/4 S 15:40:13 0:08 guile 3 kf 8639 27.0 8.9 6164 5604 pts/4 S 15:40:13 0:24 guile 4 kf 8639 1.2 43.43440427480 pts/4 S 15:40:13 3:04 guile 1 ((gc-time-taken . 114) (cells-allocated . 59683) (cell-heap-size . 98304) (bytes-malloced . 100081) (gc-malloc-threshold . 150000) (cell-heap-segments (428896 . 166752) (1098936 . 574648))) 2 ((gc-time-taken . 164) (cells-allocated . 26660) (cell-heap-size . 98304) (bytes-malloced . 339285) (gc-malloc-threshold . 506290) (cell-heap-segments (428896 . 166752) (1098936 . 574648))) 3 ((gc-time-taken . 374) (cells-allocated . 71275) (cell-heap-size . 98304) (bytes-malloced . 2499278) (gc-malloc-threshold . 2563150) (cell-heap-segments (428896 . 166752) (1098936 . 574648))) 4 ((gc-time-taken . 2394) (cells-allocated . 78698) (cell-heap-size . 98304) (bytes-malloced . 24099306) (gc-malloc-threshold . 29196388) (cell-heap-segments (428896 . 166752) (1098936 . 574648))) Hope this helps, Roland