memory limit with ample RAM

From: Neil R. Smith (neils_at_ariel.met.tamu.edu)
Date: 12/14/04

  • Next message: Thomas Leitner: "SUMMARY: Problem with ifconfig -alias" 
    Date: Tue, 14 Dec 2004 16:58:07 -0600
To: 'Tru64 Managers' <tru64-unix-managers@ornl.gov>

    Hi folks,

    We've got a user with a model in Fortran code who is seeing
    a dramatic slowdown, by a factor of 100 at least, when he increases
    the computation grid size past some threshold size; evidently about
    2 GB. This is confusing to the user and me since this ES45 4x 1GHz
    has 12GB RAM and 24GB swap spread across 3 disks.

    What would you suggest I look for?

    Some additional info:

    Platform: ES 45, 4x 1GHz, 12GB RAM
    OS: OSF1 xxx.xxx.xxx V5.1 1885 alpha
    swap: 24GB across 3 disk drives;
          eager mode

    shell: tcsh

    > limit
    cputime unlimited
    filesize unlimited
    datasize 12006804 kbytes
    stacksize 12006804 kbytes
    coredumpsize 0 kbytes
    memoryuse 12337880 kbytes
    vmemoryuse 12006804 kbytes
    descriptors 4096

    # sysconfig -q proc
    proc:
    max_proc_per_user = 512
    max_threads_per_user = 2048
    per_proc_stack_size = 12294967296
    max_per_proc_stack_size = 12294967296
    per_proc_data_size = 12294967296
    max_per_proc_data_size = 12294967296
    max_per_proc_address_space = 12294967296
    per_proc_address_space = 12294967296
    executable_stack = 0
    autonice = 0
    autonice_time = 600
    autonice_penalty = 4
    open_max_soft = 4096
    open_max_hard = 4096
    ncallout_alloc_size = 8192
    round_robin_switch_rate = 0
    sched_min_idle = 0
    give_boost = 1
    maxusers = 2048
    num_wait_queues = 2048
    num_timeout_hash_queues = 2048
    enhanced_core_name = 0
    enhanced_core_max_versions = 16
    exec_disable_arg_limit = 0
    dump_cores = 1
    dump_setugid_cores = 0
    executable_data = 0

    # sysconfig -q vm
    vm:
    ubc_minpercent = 10
    ubc_maxpercent = 100
    ubc_borrowpercent = 20
    vm_max_wrpgio_kluster = 32768
    vm_max_rdpgio_kluster = 16384
    vm_cowfaults = 4
    vm_segmentation = 1
    vm_ubcpagesteal = 24
    vm_ubcfilemaxdirtypages = 4294967295
    vm_ubcdirtypercent = 40
    ubc_maxdirtywrites = 5
    ubc_maxdirtymetadata_pcnt = 70
    ubc_kluster_cnt = 32
    vm_ubcseqstartpercent = 50
    vm_ubcseqpercent = 10
    vm_csubmapsize = 1048576
    vm_ubcbuffers = 256
    vm_syncswapbuffers = 128
    vm_asyncswapbuffers = 4
    vm_clustermap = 1048576
    vm_clustersize = 65536
    vm_syswiredpercent = 80
    vm_troll_percent = 4
    vm_inswappedmin = 1
    vm_page_free_target = 1024
    vm_page_free_swap = 522
    vm_page_free_hardswap = 16384
    vm_page_free_min = 20
    vm_page_free_reserved = 10
    vm_page_free_optimal = 522
    vm_swap_eager = 1
    swapdevice = /dev/disk/dsk9b
    vm_page_prewrite_target = 2048
    vm_ffl = 1
    ubc_ffl = 1
    vm_rss_maxpercent = 100
    anon_rss_enforce = 0
    vm_rss_block_target = 522
    vm_rss_wakeup_target = 522
    kernel_stack_pages = 0
    vm_min_kernel_address = 18446741891866165248
    malloc_percpu_cache = 1
    vm_aggressive_swap = 0
    new_wire_method = 1
    vm_segment_cache_max = 50
    gh_chunks = 0
    rad_gh_regions[0] = 0
    rad_gh_regions[1] = 0
    rad_gh_regions[2] = 0
    rad_gh_regions[3] = 0
    rad_gh_regions[4] = 0
    rad_gh_regions[5] = 0
    rad_gh_regions[6] = 0
    rad_gh_regions[7] = 0
    rad_gh_regions[8] = 0
    rad_gh_regions[9] = 0
    rad_gh_regions[10] = 0
    rad_gh_regions[11] = 0
    rad_gh_regions[12] = 0
    rad_gh_regions[13] = 0
    rad_gh_regions[14] = 0
    rad_gh_regions[15] = 0
    rad_gh_regions[16] = 0
    rad_gh_regions[17] = 0
    rad_gh_regions[18] = 0
    rad_gh_regions[19] = 0
    rad_gh_regions[20] = 0
    rad_gh_regions[21] = 0
    rad_gh_regions[22] = 0
    rad_gh_regions[23] = 0
    rad_gh_regions[24] = 0
    rad_gh_regions[25] = 0
    rad_gh_regions[26] = 0
    rad_gh_regions[27] = 0
    rad_gh_regions[28] = 0
    rad_gh_regions[29] = 0
    rad_gh_regions[30] = 0
    rad_gh_regions[31] = 0
    rad_gh_regions[32] = 0
    rad_gh_regions[33] = 0
    rad_gh_regions[34] = 0
    rad_gh_regions[35] = 0
    rad_gh_regions[36] = 0
    rad_gh_regions[37] = 0
    rad_gh_regions[38] = 0
    rad_gh_regions[39] = 0
    rad_gh_regions[40] = 0
    rad_gh_regions[41] = 0
    rad_gh_regions[42] = 0
    rad_gh_regions[43] = 0
    rad_gh_regions[44] = 0
    rad_gh_regions[45] = 0
    rad_gh_regions[46] = 0
    rad_gh_regions[47] = 0
    rad_gh_regions[48] = 0
    rad_gh_regions[49] = 0
    rad_gh_regions[50] = 0
    rad_gh_regions[51] = 0
    rad_gh_regions[52] = 0
    rad_gh_regions[53] = 0
    rad_gh_regions[54] = 0
    rad_gh_regions[55] = 0
    rad_gh_regions[56] = 0
    rad_gh_regions[57] = 0
    rad_gh_regions[58] = 0
    rad_gh_regions[59] = 0
    rad_gh_regions[60] = 0
    rad_gh_regions[61] = 0
    rad_gh_regions[62] = 0
    rad_gh_regions[63] = 0
    gh_min_seg_size = 4194304
    gh_fail_if_no_mem = 1
    private_cache_percent = 0
    gh_keep_sorted = 0
    gh_front_alloc = 1
    replicate_user_text = 1
    enable_yellow_zone = 0
    boost_pager_priority = 0
    kstack_free_target = 5
    wire_audit_count = 0
    vm_prepop_percent = 100 

    -- 
Neil R. Smith, Comp. Sys. Mngr.		neils@tamu.edu
Dept. Atmospheric Sci., Texas A&M Univ.	979/845-6272 FAX:979/862-4466
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