[ https://issues.apache.org/jira/browse/PDFBOX-3088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr reassigned PDFBOX-3088: --------------------------------------- Assignee: Tilman Hausherr > Cache glyph table to optimize concurrent access > ----------------------------------------------- > > Key: PDFBOX-3088 > URL: https://issues.apache.org/jira/browse/PDFBOX-3088 > Project: PDFBox > Issue Type: Improvement > Components: FontBox > Affects Versions: 2.0.0 > Reporter: ccouturi > Assignee: Tilman Hausherr > Priority: Minor > Labels: Optimization > Attachments: 0001-PDFBOX-3088-cache-glyph-table.patch, > Benchmark.java, test_medium.pdf > > > If several threads convert several pdf to png (one thread access to a single > document at a time) they are a contention on a lock in GlythTable. Jstack > shows that all threads are in state blocked on the synchronized block in the > getGlyph method. The lock is necessary, it's ok, but degrades performance. > This patch cache glyphs already read. > With the patch PDFBOX-3080, the follow benchmark compare 1000 pdf conversions > with 1, 8, and 50 threads. > || Simulation|| PDF 2.0-SNAPSHOT || With this patch + PDFBOX3080 || > || 1000 conversions / 1 thread | 120 s | 71 s| > || 1000 conversions / 8 threads | 76 s | 28 s| > || 1000 conversions / 50 threads | 81 s | 33 s| -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org For additional commands, e-mail: dev-h...@pdfbox.apache.org