== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 11:26:04 (1774884364)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.2549 s, 9.3 MB/s
llite.lustre-ffff8e1d9004b000.read_ahead_stats=clear
llite.lustre-ffff8e1d9004b000.read_ahead_stats=
snapshot_time             1774884409.591688020 secs.nsecs
start_time                1774884382.601668834 secs.nsecs
elapsed_time              26.990019186 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          22 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=227565: Mon Mar 30 11:45:02 2026
  read: IOPS=4, BW=4834KiB/s (4950kB/s)(5120MiB/1084512msec)
    clat (msec): min=71, max=531, avg=211.23, stdev=58.76
     lat (msec): min=71, max=531, avg=211.23, stdev=58.76
    clat percentiles (msec):
     |  1.00th=[  101],  5.00th=[  127], 10.00th=[  142], 20.00th=[  163],
     | 30.00th=[  180], 40.00th=[  192], 50.00th=[  205], 60.00th=[  220],
     | 70.00th=[  236], 80.00th=[  257], 90.00th=[  288], 95.00th=[  317],
     | 99.00th=[  384], 99.50th=[  414], 99.90th=[  460], 99.95th=[  485],
     | 99.99th=[  531]
   bw (  KiB/s): min= 1928, max=10240, per=100.00%, avg=4850.87, stdev=1410.16, samples=2147
   iops        : min=    1, max=   10, avg= 4.03, stdev= 1.49, samples=2147
  lat (msec)   : 100=0.96%, 250=76.52%, 500=22.50%, 750=0.02%
  cpu          : usr=0.30%, sys=28.94%, ctx=35433, majf=5600, minf=1305387
  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=4834KiB/s (4950kB/s), 4834KiB/s-4834KiB/s (4950kB/s-4950kB/s), io=5120MiB (5369MB), run=1084512-1084512msec