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METS Server demo

cf. Makefile for the code

Usage

make clone to download the workspace

make sequential to run workflow in sequence

make start-server & to start the METS server (in the background)

make parallel to run workflow in parallel page-wise (with timeouts and error fallback)

make parallel-chunks to run workflow in parallel job-wise (without error handling)

ocrd workspace list-page --help for the partitioning/chunking options

make rm-sequential and make rm-parallel to remove the workspaces

Variables:

  • PROCESSOR - which processor to run. Defaults to ocrd-vandalize
  • NUMBER_OF_THREADS - how many jobs to run in parallel
  • ECHO - set to echo to dry-run

Benchmark

On a machine w/ 8 cores.

Sequential:

169.31user 6.58system 2:55.65elapsed 100%CPU (0avgtext+0avgdata 209488maxresident)
0inputs+1445976outputs (0major+3411932minor)pagefaults 0swaps
/usr/bin/time make sequential  169.32s user 6.59s system 100% cpu 2:55.65 total

Parallel chunks w/4 jobs:

164.22user 6.89system 0:47.53elapsed 359%CPU (0avgtext+0avgdata 192548maxresident)k
0inputs+1274824outputs (0major+3642408minor)pagefaults 0swaps
/usr/bin/time make parallel-chunks NUMBER_OF_THREADS=4  164.22s user 6.90s system 359% cpu 47.536 total

Parallel chunks w/8 jobs

226.84user 9.27system 0:34.18elapsed 690%CPU (0avgtext+0avgdata 191928maxresident)k
0inputs+1274856outputs (0major+3827022minor)pagefaults 0swaps
/usr/bin/time make parallel-chunks NUMBER_OF_THREADS=8  226.85s user 9.28s system 690% cpu 34.188 total

Parallel chunks w/16 jobs (sanity check)

252.12user 11.21system 0:35.84elapsed 734%CPU (0avgtext+0avgdata 191968maxresident)k
400inputs+1274920outputs (19major+4210729minor)pagefaults 0swaps
/usr/bin/time make parallel-chunks NUMBER_OF_THREADS=16  252.13s user 11.21s system 734% cpu 35.850 total

Parallel page-wise w/8 jobs

422.27user 53.79system 1:35.12elapsed 500%CPU (0avgtext+0avgdata 161360maxresident)k
2616inputs+1305872outputs (11major+10164013minor)pagefaults 0swaps
/usr/bin/time make parallel  422.28s user 53.79s system 500% cpu 1:35.13 total

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