== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:37:08 (1772476628)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.12581 s, 20.5 MB/s
llite.lustre-ffff9f0b2a192000.read_ahead_stats=clear
llite.lustre-ffff9f0b2a192000.read_ahead_stats=
snapshot_time             1772476642.084930605 secs.nsecs
start_time                1772476635.151426328 secs.nsecs
elapsed_time              6.933504277 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          4 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=225558: Mon Mar  2 13:44:25 2026
  read: IOPS=12, BW=12.2MiB/s (12.8MB/s)(5120MiB/420390msec)
    clat (msec): min=42, max=288, avg=81.95, stdev=40.85
     lat (msec): min=43, max=288, avg=81.95, stdev=40.85
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   54], 10.00th=[   56], 20.00th=[   59],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   66], 60.00th=[   69],
     | 70.00th=[   72], 80.00th=[   82], 90.00th=[  146], 95.00th=[  163],
     | 99.00th=[  249], 99.50th=[  259], 99.90th=[  275], 99.95th=[  284],
     | 99.99th=[  288]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=12507.63, stdev=4828.27, samples=838
   iops        : min=    2, max=   20, avg=12.21, stdev= 4.72, samples=838
  lat (msec)   : 50=0.84%, 100=80.57%, 250=17.66%, 500=0.94%
  cpu          : usr=0.60%, sys=87.93%, ctx=13988, majf=5121, minf=1305867
  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=12.2MiB/s (12.8MB/s), 12.2MiB/s-12.2MiB/s (12.8MB/s-12.8MB/s), io=5120MiB (5369MB), run=420390-420390msec