== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 07:32:42 (1768566762)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.98994 s, 17.5 MB/s
llite.lustre-ffff8fe2b8b69800.read_ahead_stats=clear
llite.lustre-ffff8fe2b8b69800.read_ahead_stats=
snapshot_time             1768566775.692774495 secs.nsecs
start_time                1768566770.452332395 secs.nsecs
elapsed_time              5.240442100 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 samples [pages]
async_readahead           2 samples [pages]
failed_to_fast_read       36 samples [pages]
mmap_range_read           28 samples [pages]
readahead_pages           35 samples [pages] 8 4096 25567
/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=291501: Fri Jan 16 07:37:49 2026
  read: IOPS=17, BW=17.6MiB/s (18.5MB/s)(5120MiB/290911msec)
    clat (msec): min=10, max=2245, avg=56.60, stdev=86.77
     lat (msec): min=10, max=2245, avg=56.61, stdev=86.77
    clat percentiles (msec):
     |  1.00th=[   20],  5.00th=[   29], 10.00th=[   33], 20.00th=[   39],
     | 30.00th=[   42], 40.00th=[   46], 50.00th=[   50], 60.00th=[   53],
     | 70.00th=[   56], 80.00th=[   63], 90.00th=[   74], 95.00th=[   88],
     | 99.00th=[  161], 99.50th=[  211], 99.90th=[ 1854], 99.95th=[ 1905],
     | 99.99th=[ 2232]
   bw (  KiB/s): min= 1903, max=36644, per=100.00%, avg=19080.17, stdev=5184.51, samples=535
   iops        : min=    1, max=   35, avg=18.23, stdev= 5.09, samples=535
  lat (msec)   : 20=1.17%, 50=52.15%, 100=43.32%, 250=2.99%, 500=0.06%
  lat (msec)   : 750=0.08%, 2000=0.20%, >=2000=0.04%
  cpu          : usr=0.92%, sys=74.59%, ctx=24775, majf=662, minf=1310328
  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=17.6MiB/s (18.5MB/s), 17.6MiB/s-17.6MiB/s (18.5MB/s-18.5MB/s), io=5120MiB (5369MB), run=290911-290911msec