Good news! It looks like JDK7 invokes FlushFileBuffers() in the following cases:
1. MappedByteBuffer.force(). See http://bugs.sun.com/view_bug.do?bug_id=6816049 and http://hg.openjdk.java.net/jdk7/build/jdk/rev/3740c2da7cc5 2. AsynchronousFileChannel.force() I found other matches but it wasn't immediately obvious which public APIs they get invoked by. Anyway, I think we can take away two important points from this: 1. Sun/Oracle has contacted Microsoft about the use of FlushFileBuffers() and they implied it would do the job. 2. Java exposes this functionality through publicly accessible APIs. This should make it easier for you to retrofit your test program. Gili Hopefully this means they also invoke it from other places... Gili On Nov 24, 12:01 am, Gili Tzabari <cow...@bbs.darktech.org> wrote: > Hi Thomas, > > I wanted to follow up your post about Durability > problems:http://www.h2database.com/html/advanced.html?highlight=fsync&search=f... > > If you follow the Mac OS X link you refer to you will find out the > following: > > 1. fsync() flushes the OS-level disk cache to the disk, but does not > force the disk to flush its on-board write cache. > 2. Under Mac OS X you can use F_FULLFSYNC to force the disk to flush > its on-board write cache. > Source:http://lists.apple.com/archives/darwin-dev/2005/Feb/msg00072.html > 3. Under Windows you can use FlushFileBuffers() to force the disk to > flush its on-board write cache. Source: > http://www.mail-archive.com/sqlite-us...@sqlite.org/msg08132.html > andhttp://old.nabble.com/Re%3A-Performance-problem-with-3.2.7-p1591614.html > > So first of all, we need to establish whether these sources are > correct. If you rewrite your test in terms of FlushFileBuffers() does > it flush to disk correctly? Next, assuming this works, we need to > figure out whether this API is accessible through Java. If not, we can > file a RFE with Oracle as well as looking into using JNI under H2 > (ugly, but doable). > > What do you think? > > Gili -- You received this message because you are subscribed to the Google Groups "H2 Database" group. To post to this group, send email to h2-database@googlegroups.com. To unsubscribe from this group, send email to h2-database+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/h2-database?hl=en.
