== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 12:13:11 (1775837591)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.73384 s, 18.3 MB/s
llite.lustre-ffff8db785929800.read_ahead_stats=clear
llite.lustre-ffff8db785929800.read_ahead_stats=
snapshot_time             1775837604.965318828 secs.nsecs
start_time                1775837599.281932500 secs.nsecs
elapsed_time              5.683386328 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=293637: Fri Apr 10 12:19:59 2026
  read: IOPS=13, BW=13.1MiB/s (13.7MB/s)(5120MiB/391913msec)
    clat (msec): min=47, max=253, avg=76.40, stdev=29.24
     lat (msec): min=47, max=253, avg=76.40, stdev=29.24
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   56], 10.00th=[   58], 20.00th=[   59],
     | 30.00th=[   61], 40.00th=[   63], 50.00th=[   65], 60.00th=[   67],
     | 70.00th=[   70], 80.00th=[   80], 90.00th=[  131], 95.00th=[  140],
     | 99.00th=[  163], 99.50th=[  186], 99.90th=[  215], 99.95th=[  232],
     | 99.99th=[  253]
   bw (  KiB/s): min= 4096, max=20480, per=100.00%, avg=13417.91, stdev=4168.29, samples=781
   iops        : min=    4, max=   20, avg=13.09, stdev= 4.07, samples=781
  lat (msec)   : 50=1.25%, 100=81.19%, 250=17.54%, 500=0.02%
  cpu          : usr=0.64%, sys=87.01%, ctx=11427, majf=5120, minf=1305869
  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=13.1MiB/s (13.7MB/s), 13.1MiB/s-13.1MiB/s (13.7MB/s-13.7MB/s), io=5120MiB (5369MB), run=391913-391913msec