== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 13:42:01 (1772476921)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.80673 s, 18.1 MB/s
llite.lustre-ffffa03380f3d000.read_ahead_stats=clear
llite.lustre-ffffa03380f3d000.read_ahead_stats=
snapshot_time             1772476937.811409094 secs.nsecs
start_time                1772476929.394422282 secs.nsecs
elapsed_time              8.416986812 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          5 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=226294: Mon Mar  2 13:49:19 2026
  read: IOPS=12, BW=12.2MiB/s (12.8MB/s)(5120MiB/419242msec)
    clat (msec): min=43, max=253, avg=81.68, stdev=32.45
     lat (msec): min=43, max=253, avg=81.68, stdev=32.45
    clat percentiles (msec):
     |  1.00th=[   53],  5.00th=[   57], 10.00th=[   60], 20.00th=[   63],
     | 30.00th=[   65], 40.00th=[   67], 50.00th=[   69], 60.00th=[   72],
     | 70.00th=[   75], 80.00th=[   83], 90.00th=[  142], 95.00th=[  150],
     | 99.00th=[  188], 99.50th=[  218], 99.90th=[  230], 99.95th=[  239],
     | 99.99th=[  255]
   bw (  KiB/s): min= 4096, max=18432, per=100.00%, avg=12537.88, stdev=4096.62, samples=836
   iops        : min=    4, max=   18, avg=12.18, stdev= 4.00, samples=836
  lat (msec)   : 50=0.47%, 100=81.00%, 250=18.52%, 500=0.02%
  cpu          : usr=0.63%, sys=86.60%, ctx=14149, majf=5136, minf=1305855
  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=12.2MiB/s (12.8MB/s), 12.2MiB/s-12.2MiB/s (12.8MB/s-12.8MB/s), io=5120MiB (5369MB), run=419242-419242msec