== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:04:05 (1772474645)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.81702 s, 18.0 MB/s
llite.lustre-ffff96aded04e000.read_ahead_stats=clear
llite.lustre-ffff96aded04e000.read_ahead_stats=
snapshot_time             1772474663.361975233 secs.nsecs
start_time                1772474654.057982015 secs.nsecs
elapsed_time              9.303993218 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          45 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=225185: Mon Mar  2 13:11:21 2026
  read: IOPS=12, BW=12.3MiB/s (12.9MB/s)(5120MiB/414838msec)
    clat (msec): min=13, max=216, avg=80.78, stdev=25.13
     lat (msec): min=13, max=216, avg=80.78, stdev=25.13
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   56], 10.00th=[   59], 20.00th=[   63],
     | 30.00th=[   66], 40.00th=[   69], 50.00th=[   73], 60.00th=[   78],
     | 70.00th=[   85], 80.00th=[   96], 90.00th=[  122], 95.00th=[  136],
     | 99.00th=[  161], 99.50th=[  169], 99.90th=[  188], 99.95th=[  203],
     | 99.99th=[  218]
   bw (  KiB/s): min= 5988, max=18432, per=100.00%, avg=12691.37, stdev=3187.63, samples=823
   iops        : min=    5, max=   18, avg=11.91, stdev= 3.17, samples=823
  lat (msec)   : 20=0.02%, 50=0.68%, 100=81.04%, 250=18.26%
  cpu          : usr=0.63%, sys=59.28%, ctx=16865, majf=6271, minf=1304717
  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=12.3MiB/s (12.9MB/s), 12.3MiB/s-12.3MiB/s (12.9MB/s-12.9MB/s), io=5120MiB (5369MB), run=414838-414838msec