option to accumulate stats over different log files

[wookietreiber]

In some cases it might make sense to accumulate the syscalls over multiple log files. The following is sort of a dummy example to showcase this:

$ strace -T -ttt -ff -o /tmp/strace-dd.log dd if=/dev/zero of=/dev/null count=1024 bs=1M
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.322192 s, 3.3 GB/s

$ strace -T -ttt -ff -o /tmp/strace-dd.log dd if=/dev/zero of=/dev/null count=1024 bs=1M
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.365162 s, 2.9 GB/s

$ ls -lh /tmp/strace-dd.log.*
-rw-r--r-- 1 wookietreiber users 261K Mar 26 11:08 /tmp/strace-dd.log.23687
-rw-r--r-- 1 wookietreiber users 261K Mar 26 11:08 /tmp/strace-dd.log.23694

$ strace-analyzer write /tmp/strace-dd.log.* | column -t 
write  1G   in  27.621  ms  (~  36G   /  s)  with  1024  ops  (~  1M  /  op,  ~  1M  request  size)  /dev/null
write  101  in  229     us  (~  431K  /  s)  with  3     ops  (~  34  /  op,  ~  34  request  size)  STDERR
write  1G   in  27.885  ms  (~  36G   /  s)  with  1024  ops  (~  1M  /  op,  ~  1M  request  size)  /dev/null
write  101  in  4.667   ms  (~  21K   /  s)  with  3     ops  (~  34  /  op,  ~  34  request  size)  STDERR

Also, if the stats are not accumulated over multiple files, the output should include from which log file they are.