Messages in this thread | | | Date | Tue, 04 Mar 2003 00:11:35 -0800 | From | "Martin J. Bligh" <> | Subject | Odd benchmark results ... 62 vs -mm vs -mjb |
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The usual 16x NUMA-Q system ... this is all cache warm out of pagecache, so I don't see why AS would make a difference. -mm and -mjb are fairly consistent (as I'd expect) except for kernbench -j256 (the middle one) where you somehow do dramtically better (on systime especially). These are the averages of 5 runs, and they only move by a second or two of systime, so I don't think it's experimental error. I ran SDET as well, but it wasn't very interesting.
Kernbench: (make -j N vmlinux, where N = 2 x num_cpus) Elapsed System User CPU 2.5.63 45.47 111.20 563.81 1483.50 2.5.63-mm2 44.27 94.30 562.88 1484.00 2.5.63-mjb2 44.09 94.38 557.26 1477.00
Kernbench: (make -j N vmlinux, where N = 16 x num_cpus) Elapsed System User CPU 2.5.63 47.09 138.43 567.92 1499.25 2.5.63-mm2 44.94 108.35 565.37 1497.50 2.5.63-mjb2 45.53 118.06 560.48 1489.50
Kernbench: (make -j vmlinux, maximal tasks) Elapsed System User CPU 2.5.63 47.30 138.33 568.13 1497.00 2.5.63-mm2 45.62 119.91 565.66 1499.25 2.5.63-mjb2 45.17 117.80 560.62 1500.50
diffprofile 2.5.63-mm2 2.5.63-mjb2 (both have objrmap + fixes) (+ gets worse going from -mm to -mjb, - better) for -j256.
12196 7.9% total 9773 81.5% .text.lock.file_table 3484 7.5% default_idle 915 554.5% do_generic_mapping_read 823 21.5% get_empty_filp 569 26.8% __fput 462 76.0% dput 457 11.2% vm_enough_memory 456 29.9% file_move 386 21.6% page_add_rmap 215 1.5% do_anonymous_page 151 23.3% fd_install 137 415.2% eventpoll_init_file 117 354.5% kmem_cache_alloc 100 0.0% pmd_ctor 82 18.3% file_ra_state_init 70 0.0% update_atime 67 1.4% __copy_to_user_ll 63 2.2% zap_pte_range 62 24.0% __set_page_dirty_buffers 59 3.8% buffered_rmqueue 55 2.0% atomic_dec_and_lock 52 44.1% filp_close 51 4.5% vfs_read 50 33.3% prep_new_page ... -52 -100.0% free_pages_bulk -54 -73.0% lru_cache_add -56 -100.0% migration_task -57 -18.6% flush_signal_handlers -68 -69.4% set_cpus_allowed -68 -10.3% kmap_atomic -69 -49.6% set_page_address -75 -60.0% sched_best_cpu -80 -100.0% prepare_to_wait_exclusive -82 -26.3% exit_notify -90 -25.0% remove_shared_vm_struct -108 -84.4% kmalloc -110 -44.0% kmem_cache_free -151 -88.3% eventpoll_release -172 -19.1% strnlen_user -180 -100.0% pgd_ctor -207 -45.3% complete -207 -100.0% find_trylock_page -210 -100.0% one_sec_update_atime -276 -100.0% __down -292 -90.7% current_kernel_time -351 -35.1% clear_page_tables -409 -53.9% __wake_up -543 -28.2% path_lookup -567 -25.9% do_schedule -707 -38.1% do_no_page -736 -23.0% find_get_page
OK, so who killed .text.lock.file_table? and how? ;-)
If I do a "-j" instead (infinte tasks), it looks boringly similar from the results, but the profiles tell a different story: (+ gets worse going from -mm to -mjb, - better)
3426 18.3% .text.lock.file_table 937 574.8% do_generic_mapping_read 610 14.6% vm_enough_memory 470 72.3% dput 285 2.0% do_anonymous_page 260 14.8% page_add_rmap 161 10.4% buffered_rmqueue 158 493.8% eventpoll_init_file 130 0.0% pmd_ctor 107 44.0% __set_page_dirty_buffers 99 12.8% fd_install 92 58.2% prep_new_page 64 177.8% kmem_cache_alloc 60 0.0% update_atime ... -50 -100.0% free_pages_bulk -53 -72.6% lru_cache_add -55 -15.1% remove_shared_vm_struct -56 -2.7% do_page_fault -57 -9.1% copy_process -59 -100.0% migration_task -65 -56.5% wait_for_completion -69 -53.5% set_page_address -70 -41.2% dup_task_struct -72 -10.9% kmap_atomic -76 -24.1% exit_notify -83 -27.4% flush_signal_handlers -86 -68.3% sched_best_cpu -99 -76.7% kmalloc -104 -36.6% kmem_cache_free -106 -11.7% strnlen_user -114 -23.6% __wake_up -117 -9.4% vfs_read -123 -2.7% get_empty_filp -131 -76.6% eventpoll_release -135 -23.5% pte_alloc_one -144 -13.8% link_path_walk -148 -3.0% __copy_to_user_ll -163 -35.2% complete -185 -6.8% __fput -191 -100.0% one_sec_update_atime -215 -100.0% pgd_ctor -227 -76.4% current_kernel_time -236 -100.0% find_trylock_page -252 -7.7% atomic_dec_and_lock -285 -28.4% clear_page_tables -498 -24.4% path_lookup -524 -6.4% d_lookup -534 -26.1% do_schedule -603 -32.7% do_no_page -817 -24.9% find_get_page -1911 -4.0% default_idle -2470 -1.5% total
BTW, I have your "atime" patch you sent me in -mjb2, and fstab is:
# /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> /dev/sda2 / ext2 defaults,noatime,errors=remount-ro 0 1 /dev/sdd1 /home/mbligh ext3 defaults,noatime 0 2 proc /proc proc defaults 0 0 /dev/cdrom /cdrom iso9660 defaults,ro,user,noauto 0 0 ramfs /ram ramfs defaults 0 2
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