== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 15:34:58 (1773689698)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.36317 s, 19.6 MB/s
llite.lustre-ffff9f7887023800.read_ahead_stats=clear
llite.lustre-ffff9f7887023800.read_ahead_stats=
snapshot_time             1773689713.069955327 secs.nsecs
start_time                1773689705.544946920 secs.nsecs
elapsed_time              7.525008407 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=230707: Mon Mar 16 15:42:24 2026
  read: IOPS=11, BW=11.9MiB/s (12.5MB/s)(5120MiB/429236msec)
    clat (msec): min=43, max=281, avg=83.67, stdev=41.73
     lat (msec): min=43, max=281, avg=83.67, stdev=41.73
    clat percentiles (msec):
     |  1.00th=[   51],  5.00th=[   55], 10.00th=[   57], 20.00th=[   61],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   67], 60.00th=[   69],
     | 70.00th=[   73], 80.00th=[   84], 90.00th=[  155], 95.00th=[  171],
     | 99.00th=[  236], 99.50th=[  255], 99.90th=[  271], 99.95th=[  275],
     | 99.99th=[  284]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=12247.00, stdev=4802.97, samples=856
   iops        : min=    2, max=   20, avg=11.95, stdev= 4.69, samples=856
  lat (msec)   : 50=0.78%, 100=80.64%, 250=17.97%, 500=0.61%
  cpu          : usr=0.60%, sys=87.80%, ctx=13977, 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=11.9MiB/s (12.5MB/s), 11.9MiB/s-11.9MiB/s (12.5MB/s-12.5MB/s), io=5120MiB (5369MB), run=429236-429236msec