== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:05:26 (1772474726)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.00882 s, 17.5 MB/s
llite.lustre-ffff98d4c5eee800.read_ahead_stats=clear
llite.lustre-ffff98d4c5eee800.read_ahead_stats=
snapshot_time             1772474743.200395616 secs.nsecs
start_time                1772474735.019234858 secs.nsecs
elapsed_time              8.181160758 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          29 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=226667: Mon Mar  2 13:12:28 2026
  read: IOPS=12, BW=12.7MiB/s (13.4MB/s)(5120MiB/401617msec)
    clat (msec): min=12, max=210, avg=78.22, stdev=23.98
     lat (msec): min=12, max=210, avg=78.22, stdev=23.98
    clat percentiles (msec):
     |  1.00th=[   50],  5.00th=[   55], 10.00th=[   57], 20.00th=[   61],
     | 30.00th=[   64], 40.00th=[   67], 50.00th=[   70], 60.00th=[   75],
     | 70.00th=[   81], 80.00th=[   93], 90.00th=[  120], 95.00th=[  130],
     | 99.00th=[  150], 99.50th=[  159], 99.90th=[  176], 99.95th=[  184],
     | 99.99th=[  211]
   bw (  KiB/s): min= 2048, max=20480, per=100.00%, avg=13093.24, stdev=3287.53, samples=798
   iops        : min=    2, max=   20, avg=12.35, stdev= 3.25, samples=798
  lat (msec)   : 20=0.06%, 50=1.11%, 100=81.43%, 250=17.40%
  cpu          : usr=0.64%, sys=63.62%, ctx=15956, majf=6043, minf=1304944
  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=12.7MiB/s (13.4MB/s), 12.7MiB/s-12.7MiB/s (13.4MB/s-13.4MB/s), io=5120MiB (5369MB), run=401617-401617msec