== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 03:23:59 (1769761439)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.86528 s, 17.9 MB/s
llite.lustre-ffff9f07b1467000.read_ahead_stats=clear
llite.lustre-ffff9f07b1467000.read_ahead_stats=
snapshot_time             1769761455.786011999 secs.nsecs
start_time                1769761447.334678432 secs.nsecs
elapsed_time              8.451333567 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          5 samples [pages]
failed_to_reach_end       1 samples [pages]
failed_to_fast_read       230 samples [pages]
mmap_range_read           225 samples [pages]
readahead_pages           225 samples [pages] 8 128 25370
/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=226348: Fri Jan 30 03:31:08 2026
  read: IOPS=12, BW=12.5MiB/s (13.1MB/s)(5120MiB/409220msec)
    clat (msec): min=43, max=258, avg=79.73, stdev=35.27
     lat (msec): min=43, max=258, avg=79.74, stdev=35.27
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   55], 10.00th=[   57], 20.00th=[   60],
     | 30.00th=[   62], 40.00th=[   64], 50.00th=[   66], 60.00th=[   69],
     | 70.00th=[   72], 80.00th=[   80], 90.00th=[  142], 95.00th=[  153],
     | 99.00th=[  213], 99.50th=[  226], 99.90th=[  245], 99.95th=[  249],
     | 99.99th=[  259]
   bw (  KiB/s): min= 4071, max=20480, per=100.00%, avg=12846.25, stdev=4474.45, samples=816
   iops        : min=    3, max=   20, avg=12.50, stdev= 4.39, samples=816
  lat (msec)   : 50=1.19%, 100=80.90%, 250=17.87%, 500=0.04%
  cpu          : usr=0.63%, sys=87.41%, ctx=14209, majf=5126, minf=1305864
  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=12.5MiB/s (13.1MB/s), 12.5MiB/s-12.5MiB/s (13.1MB/s-13.1MB/s), io=5120MiB (5369MB), run=409220-409220msec