== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 21:35:32 (1772764532)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 8.73989 s, 12.0 MB/s
llite.lustre-ffff8c4b9eeeb800.read_ahead_stats=clear
llite.lustre-ffff8c4b9eeeb800.read_ahead_stats=
snapshot_time             1772764556.114886924 secs.nsecs
start_time                1772764545.211583547 secs.nsecs
elapsed_time              10.903303377 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          5 samples [pages]
async_readahead           2 samples [pages]
failed_to_fast_read       36 samples [pages]
mmap_range_read           28 samples [pages]
readahead_pages           35 samples [pages] 8 4096 25567
/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=301809: Thu Mar  5 21:48:58 2026
  read: IOPS=6, BW=6746KiB/s (6908kB/s)(5120MiB/777140msec)
    clat (msec): min=44, max=433, avg=151.43, stdev=42.14
     lat (msec): min=44, max=433, avg=151.43, stdev=42.14
    clat percentiles (msec):
     |  1.00th=[   92],  5.00th=[  103], 10.00th=[  109], 20.00th=[  118],
     | 30.00th=[  127], 40.00th=[  134], 50.00th=[  142], 60.00th=[  153],
     | 70.00th=[  165], 80.00th=[  182], 90.00th=[  207], 95.00th=[  236],
     | 99.00th=[  288], 99.50th=[  300], 99.90th=[  388], 99.95th=[  426],
     | 99.99th=[  435]
   bw (  KiB/s): min= 2023, max=12288, per=100.00%, avg=6767.11, stdev=1699.27, samples=1543
   iops        : min=    1, max=   12, avg= 6.01, stdev= 1.76, samples=1543
  lat (msec)   : 50=0.06%, 100=3.93%, 250=92.77%, 500=3.24%
  cpu          : usr=0.45%, sys=52.68%, ctx=21790, majf=5392, minf=1305597
  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=6746KiB/s (6908kB/s), 6746KiB/s-6746KiB/s (6908kB/s-6908kB/s), io=5120MiB (5369MB), run=777140-777140msec