On 07/01/2020 1:28 am, Vojtěch Čihák via fpc-pascal wrote: > I found this article: https://drewdevault.com/2020/01/04/Slow.html > but FPC is missing, so I wrote simple:
On a side note, and for comparison... According to that website, he/she tested Java and got the following: Lang Exec time Total syscalls Unique syscalls Size (KiB) Java 0.07s real 226 26 15743KiB So the resulting Java.class is 16 MByte in size!!! How? I did the same on my system here with the latest OpenJDK 8 & 11.0.5. The resulting size of the class file was identical with Java 8 & 11 and was as follows: $ javac -version javac 1.8.0_232 $ javac Test.java $ ls -l Test* -rw-rw-r-- 1 graemeg graemeg 413 Jan 8 22:54 Test.class -rw-rw-r-- 1 graemeg graemeg 115 Jan 8 22:53 Test.java My resulting class file is only 413 bytes. So how does that website owner get 16 MByte? Regarding Execution time. It is interesting to note that Java 11 was on avg 18.6% faster that Java 8. As for the syscalls, not sure if I'm doing this right: $ strace -C java Test ...snip.... % time seconds usecs/call calls syscall 98.51 0.006797 3399 2 futex 0.67 0.000046 2 21 mprotect 0.35 0.000024 24 1 clone 0.25 0.000017 9 2 munmap 0.13 0.000009 5 2 getpid 0.10 0.000007 0 27 mmap 0.00 0.000000 0 11 read ...snip... ------------------------------------------------------------ 100.00 0.006900 198 total That's 26 syscalls less than that website. It is interesting that 98% of the time is spent with just two calls to futex. Clearly a very slow syscall compared to the others. Regards, Graeme _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
