Messages in this thread | | | Date | Sat, 14 Jun 2003 14:18:47 -0400 | From | Larry Auton <> | Subject | direct i/o problem with 2.4.20 and 2.4.21rc7 |
| |
I have an application that requires direct i/o to thousands of files. On 2.4.19 the open's would eventually fail (at around 7200 files). On 2.4.20 and 2.4.21rc7 the machine hangs.
Here's a sample program to do the deed:
wget http://www.skarven.net/lda/crashme.c cc -o crashme crashme.c # compile it ./crashme 4000 # OK ./crashme 9999 # CRASH
It's a little obfuscated to eliminate the need for root privileges to mess with rlimit. It simply opens a bunch of files with O_DIRECT and, when enough files are open, the system will hang.
The system hangs when '/proc/slabinfo' reports that 'kiobuf' reaches just over 7230 active objects. I don't believe that this problem is specific to any particular file system as the failure occurs when using both ext2 and reiserfs.
Larry Auton - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |