== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 23:23:15 (1772425395)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.37448 s, 16.4 MB/s
llite.lustre-ffff9dec32a26800.read_ahead_stats=clear
llite.lustre-ffff9dec32a26800.read_ahead_stats=
snapshot_time             1772425411.636680102 secs.nsecs
start_time                1772425403.508105594 secs.nsecs
elapsed_time              8.128574508 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=225572: Sun Mar  1 23:30:57 2026
  read: IOPS=11, BW=11.6MiB/s (12.1MB/s)(5120MiB/442594msec)
    clat (msec): min=48, max=307, avg=86.27, stdev=45.43
     lat (msec): min=48, max=307, avg=86.27, stdev=45.43
    clat percentiles (msec):
     |  1.00th=[   52],  5.00th=[   59], 10.00th=[   60], 20.00th=[   62],
     | 30.00th=[   63], 40.00th=[   65], 50.00th=[   68], 60.00th=[   72],
     | 70.00th=[   78], 80.00th=[   86], 90.00th=[  153], 95.00th=[  169],
     | 99.00th=[  279], 99.50th=[  288], 99.90th=[  296], 99.95th=[  296],
     | 99.99th=[  309]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=11872.16, stdev=4717.59, samples=882
   iops        : min=    2, max=   18, avg=11.58, stdev= 4.61, samples=882
  lat (msec)   : 50=0.31%, 100=81.43%, 250=16.09%, 500=2.17%
  cpu          : usr=0.62%, sys=88.77%, ctx=13884, 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=11.6MiB/s (12.1MB/s), 11.6MiB/s-11.6MiB/s (12.1MB/s-12.1MB/s), io=5120MiB (5369MB), run=442594-442594msec