== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:27:57 (1772476077)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.91211 s, 17.7 MB/s
llite.lustre-ffff8dd6ecaa7800.read_ahead_stats=clear
llite.lustre-ffff8dd6ecaa7800.read_ahead_stats=
snapshot_time             1772476090.747192538 secs.nsecs
start_time                1772476085.463393815 secs.nsecs
elapsed_time              5.283798723 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          3 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=296997: Mon Mar  2 13:34:15 2026
  read: IOPS=14, BW=14.2MiB/s (14.9MB/s)(5120MiB/361257msec)
    clat (msec): min=11, max=203, avg=70.35, stdev=26.41
     lat (msec): min=11, max=203, avg=70.36, stdev=26.41
    clat percentiles (msec):
     |  1.00th=[   44],  5.00th=[   50], 10.00th=[   52], 20.00th=[   54],
     | 30.00th=[   55], 40.00th=[   57], 50.00th=[   58], 60.00th=[   61],
     | 70.00th=[   64], 80.00th=[  107], 90.00th=[  115], 95.00th=[  121],
     | 99.00th=[  142], 99.50th=[  159], 99.90th=[  180], 99.95th=[  190],
     | 99.99th=[  203]
   bw (  KiB/s): min= 4096, max=22528, per=100.00%, avg=14553.53, stdev=4653.84, samples=720
   iops        : min=    4, max=   22, avg=14.08, stdev= 4.54, samples=720
  lat (msec)   : 20=0.16%, 50=7.50%, 100=69.65%, 250=22.70%
  cpu          : usr=0.68%, sys=82.40%, ctx=11769, majf=5232, minf=1305755
  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=14.2MiB/s (14.9MB/s), 14.2MiB/s-14.2MiB/s (14.9MB/s-14.9MB/s), io=5120MiB (5369MB), run=361257-361257msec