== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 23:06:40 (1767326800)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.18503 s, 17.0 MB/s
llite.lustre-ffff91a75d5c2800.read_ahead_stats=clear
llite.lustre-ffff91a75d5c2800.read_ahead_stats=
snapshot_time             1767326815.326498211 secs.nsecs
start_time                1767326808.577653570 secs.nsecs
elapsed_time              6.748844641 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=229309: Thu Jan  1 23:12:59 2026
  read: IOPS=14, BW=14.2MiB/s (14.9MB/s)(5120MiB/360984msec)
    clat (msec): min=33, max=230, avg=70.30, stdev=33.31
     lat (msec): min=33, max=230, avg=70.30, stdev=33.31
    clat percentiles (msec):
     |  1.00th=[   41],  5.00th=[   44], 10.00th=[   47], 20.00th=[   50],
     | 30.00th=[   52], 40.00th=[   54], 50.00th=[   56], 60.00th=[   59],
     | 70.00th=[   64], 80.00th=[  105], 90.00th=[  122], 95.00th=[  134],
     | 99.00th=[  194], 99.50th=[  203], 99.90th=[  218], 99.95th=[  222],
     | 99.99th=[  232]
   bw (  KiB/s): min= 4096, max=24576, per=100.00%, avg=14563.22, stdev=5657.60, samples=719
   iops        : min=    4, max=   24, avg=14.21, stdev= 5.53, samples=719
  lat (msec)   : 50=23.61%, 100=54.82%, 250=21.56%
  cpu          : usr=0.77%, sys=85.94%, ctx=13299, 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=14.2MiB/s (14.9MB/s), 14.2MiB/s-14.2MiB/s (14.9MB/s-14.9MB/s), io=5120MiB (5369MB), run=360984-360984msec