As performance engineer I come across various problems.� Here is one when the server crashed due to lack of free memory. See the error here.


Aug 21 00:09:00 xxxx kernel: java invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0
Aug 21 00:09:00 xxxx kernel:
Aug 21 00:09:00 xxxx kernel: Call Trace:
Aug 21 00:09:00 xxxx kernel: [<ffffffff800c0f4a>] out_of_memory+0x8e/0x2f5
Aug 21 00:09:00 xxxx kernel: [<ffffffff8000f263>] __alloc_pages+0x245/0x2ce
Aug 21 00:09:00 xxxx kernel: [<ffffffff8008a745>] enqueue_task+0x41/0x56
Aug 21 00:09:00 xxxx kernel: [<ffffffff80012946>] __do_page_cache_readahead+0x95/0x1d9
Aug 21 00:09:00 xxxx kernel: [<ffffffff8003d671>] lock_timer_base+0x1b/0x3c
Aug 21 00:09:00 xxxx kernel: [<ffffffff800357a0>] find_extend_vma+0x16/0x59
Aug 21 00:09:00 xxxx kernel: [<ffffffff800132e5>] filemap_nopage+0x148/0x322
Aug 21 00:09:00 xxxx kernel: [<ffffffff80008848>] __handle_mm_fault+0x1f8/0xe23
Aug 21 00:09:00 xxxx kernel: [<ffffffff8006686f>] do_page_fault+0x4cb/0x830
Aug 21 00:09:00 xxxx kernel: [<ffffffff8005dde9>] error_exit+0x0/0x84
Aug 21 00:09:00 xxxx kernel:
Aug 21 00:09:00 xxxx kernel: Mem-info:
Aug 21 00:09:00 xxxx kernel: Node 0 DMA per-cpu:
Aug 21 00:09:00 xxxx kernel: cpu 0 hot: high 0, batch 1 used:0
Aug 21 00:09:00 xxxx kernel: cpu 0 cold: high 0, batch 1 used:0