The performance of opensourcecobol 4j is very slow

[ytr-sakamoto]

Since I have focused on fixing opesourcecobol 4j to pass COBOL85 test cases, the performance of compiling and executing is very slow.

1. Compared to opensource COBOL, the process which translates COBOL to java is slow.
2. Compared to opensource COBOL, running the Java program produced by cobc command requires huge memory space and much more executing time.
3. Reading and writing SEQUENTIAL files is slow since the file I/O library buffers no data.
4. Reading and writing INDEXED files is slow. One of possible causes may be that parameters of Berkley DB Java Edition is not appropriate.

I will measure the performance of opensource COBOL 4j and show the result.

[ytr-sakamoto]

2. Compared to opensource COBOL, running the Java program produced by cobc command requires huge memory space and much more executing time.

Use profiling tools (JProfiler, Eclipse Memory Analyzer, VisualVM, ...etc) and identify problems.

3. Reading and writing SEQUENTIAL files is slow since the file I/O library buffers no data.

Develop a class controling data buffer for SEQUENTIAL file I/O

4. Reading and writing INDEXED files is slow. One of possible causes may be that parameters of Berkley DB Java Edition is not appropriate.

In addtion to a performance problem, some COBOL85 test cases related to INDEXED file fails.
Rewriting CobolIndexedFile and using an other storage library (e.g. SQLite) may solve these problems.