== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 14:21:55 (1774894915)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 7.84978 s, 13.4 MB/s
llite.lustre-ffff8eca10307000.read_ahead_stats=clear
llite.lustre-ffff8eca10307000.read_ahead_stats=
snapshot_time             1774894931.148405248 secs.nsecs
start_time                1774894925.008796201 secs.nsecs
elapsed_time              6.139609047 secs.nsecs
hits                      25567 samples [pages]
misses                    33 samples [pages]
zero_size_window          3 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=292901: Mon Mar 30 14:30:19 2026
  read: IOPS=10, BW=10.5MiB/s (11.0MB/s)(5120MiB/485901msec)
    clat (msec): min=54, max=310, avg=94.75, stdev=42.12
     lat (msec): min=54, max=310, avg=94.75, stdev=42.12
    clat percentiles (msec):
     |  1.00th=[   57],  5.00th=[   59], 10.00th=[   63], 20.00th=[   69],
     | 30.00th=[   73], 40.00th=[   79], 50.00th=[   83], 60.00th=[   88],
     | 70.00th=[   93], 80.00th=[  101], 90.00th=[  144], 95.00th=[  167],
     | 99.00th=[  268], 99.50th=[  271], 99.90th=[  275], 99.95th=[  292],
     | 99.99th=[  313]
   bw (  KiB/s): min= 2048, max=18432, per=100.00%, avg=10816.45, stdev=3684.88, samples=969
   iops        : min=    2, max=   18, avg=10.55, stdev= 3.60, samples=969
  lat (msec)   : 100=79.65%, 250=17.36%, 500=2.99%
  cpu          : usr=0.48%, sys=87.37%, ctx=12243, 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=10.5MiB/s (11.0MB/s), 10.5MiB/s-10.5MiB/s (11.0MB/s-11.0MB/s), io=5120MiB (5369MB), run=485901-485901msec