On Wed, 9 Nov 2022 20:15:57 GMT, Xubo Zhang <d...@openjdk.org> wrote:
> NativePRNG SecureRandom doesn’t scale with number of threads. The performance > starts dropping as we increase the number of threads. Even going from 1 > thread to 2 threads shows significant drop. The bottleneck is the singleton > RandomIO instance. Making the RandomIO ThreadLocal helps in removing this > bottleneck. > > Here are the jmh thrpt ops/s data for SecureRandomBench.nextBytes, > algorithm=NativePRNGNonBlocking, datasize=64, notshared: > > <html xmlns:v="urn:schemas-microsoft-com:vml" > xmlns:o="urn:schemas-microsoft-com:office:office" > xmlns:x="urn:schemas-microsoft-com:office:excel" > xmlns="http://www.w3.org/TR/REC-html40";> > > <head> > > <meta name=ProgId content=Excel.Sheet> > <meta name=Generator content="Microsoft Excel 15"> > <link id=Main-File rel=Main-File > href="file:///C:/Users/xbzhang/AppData/Local/Temp/msohtmlclip1/01/clip.htm"> > <link rel=File-List > href="file:///C:/Users/xbzhang/AppData/Local/Temp/msohtmlclip1/01/clip_filelist.xml"> > > > > </head> > > <body link="#0563C1" vlink="#954F72"> > > > > #threads | singleton RandomIO | ThreadLocal RandomIO > -- | -- | -- > 1 | 1269133 | 1279088 > 2 | 862923 | 1362066 > 3 | 819734 | 1630522 > 4 | 809128 | 1614500 > 5 | 821514 | 1594965 > 6 | 808795 | 1545045 > 7 | 783050 | 1499388 > 8 | 787236 | 1470004 > > > > </body> > > </html> By using thread-local, is it possible to get the same random number in two threads? ------------- PR: https://git.openjdk.org/jdk/pull/11069
