== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 00:37:07 (1764740227)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.0652 s, 17.3 MB/s
llite.lustre-ffff99c2f29e6000.read_ahead_stats=clear
llite.lustre-ffff99c2f29e6000.read_ahead_stats=
snapshot_time             1764740240.884176179 secs.nsecs
start_time                1764740235.874664947 secs.nsecs
elapsed_time              5.009511232 secs.nsecs
hits                      25568 samples [pages]
misses                    32 samples [pages]
failed_grab_cache_page    28 samples [pages]
zero_size_window          3 samples [pages]
async_readahead           3 samples [pages]
failed_to_fast_read       34 samples [pages]
mmap_range_read           28 samples [pages]
readahead_pages           34 samples [pages] 8 9216 25568
/usr/bin/fio
thp                     : Memory Advise Huge Page
read_test: (g=0): rw=read, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=mmap, iodepth=1
fio-3.19
Starting 1 process

read_test: (groupid=0, jobs=1): err= 0: pid=292091: Wed Dec  3 00:43:16 2025
  read: IOPS=14, BW=14.5MiB/s (15.2MB/s)(5120MiB/353027msec)
    clat (msec): min=14, max=230, avg=68.78, stdev=29.31
     lat (msec): min=14, max=230, avg=68.78, stdev=29.31
    clat percentiles (msec):
     |  1.00th=[   40],  5.00th=[   46], 10.00th=[   48], 20.00th=[   51],
     | 30.00th=[   52], 40.00th=[   54], 50.00th=[   55], 60.00th=[   58],
     | 70.00th=[   64], 80.00th=[  106], 90.00th=[  115], 95.00th=[  123],
     | 99.00th=[  167], 99.50th=[  190], 99.90th=[  211], 99.95th=[  224],
     | 99.99th=[  230]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=14886.47, stdev=5286.92, samples=703
   iops        : min=    4, max=   24, avg=14.53, stdev= 5.17, samples=703
  lat (msec)   : 20=0.02%, 50=20.80%, 100=56.64%, 250=22.54%
  cpu          : usr=0.68%, sys=85.36%, ctx=11520, majf=5101, minf=1305887
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=5120,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=14.5MiB/s (15.2MB/s), 14.5MiB/s-14.5MiB/s (15.2MB/s-15.2MB/s), io=5120MiB (5369MB), run=353027-353027msec