== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 15:21:49 (1767730909)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.28296 s, 19.8 MB/s
llite.lustre-ffff8f1882a6e800.read_ahead_stats=clear
llite.lustre-ffff8f1882a6e800.read_ahead_stats=
snapshot_time             1767730922.539245175 secs.nsecs
start_time                1767730916.551501451 secs.nsecs
elapsed_time              5.987743724 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=228441: Tue Jan  6 15:27:43 2026
  read: IOPS=15, BW=15.1MiB/s (15.8MB/s)(5120MiB/338819msec)
    clat (msec): min=32, max=202, avg=66.01, stdev=28.19
     lat (msec): min=32, max=202, avg=66.01, stdev=28.19
    clat percentiles (msec):
     |  1.00th=[   37],  5.00th=[   43], 10.00th=[   45], 20.00th=[   47],
     | 30.00th=[   50], 40.00th=[   51], 50.00th=[   54], 60.00th=[   56],
     | 70.00th=[   61], 80.00th=[  101], 90.00th=[  114], 95.00th=[  123],
     | 99.00th=[  142], 99.50th=[  153], 99.90th=[  182], 99.95th=[  188],
     | 99.99th=[  203]
   bw (  KiB/s): min= 6144, max=24576, per=100.00%, avg=15518.79, stdev=5618.71, samples=675
   iops        : min=    6, max=   24, avg=15.14, stdev= 5.50, samples=675
  lat (msec)   : 50=36.37%, 100=43.46%, 250=20.18%
  cpu          : usr=0.66%, sys=86.31%, ctx=13170, majf=5126, minf=1305863
  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=15.1MiB/s (15.8MB/s), 15.1MiB/s-15.1MiB/s (15.8MB/s-15.8MB/s), io=5120MiB (5369MB), run=338819-338819msec