== sanity test 255a: check 'lfs ladvise -a willread' ===== 22:14:49 (1775873689)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.226 s, 10.3 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=8
fail_loc=0x237
Asynchronous ladvise shouldn't wait
llite.lustre-ffff9540c7f33800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.346688
Iter 1/10: OSS cache speed: 0.432393
Iter 1/10: ladvise speed: 0.461654
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.473326
Iter 2/10: OSS cache speed: 0.492883
Iter 2/10: ladvise speed: 0.505517
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.463181
Iter 3/10: OSS cache speed: 0.51034
Iter 3/10: ladvise speed: 0.625055
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.517428
Iter 4/10: OSS cache speed: 0.601196
Iter 4/10: ladvise speed: 0.672735
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.564749
Iter 5/10: OSS cache speed: 0.655279
Iter 5/10: ladvise speed: 0.771916
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.676268
Iter 6/10: OSS cache speed: 0.774209
Iter 6/10: ladvise speed: 0.805984
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.640888
Iter 7/10: OSS cache speed: 0.734426
Iter 7/10: ladvise speed: 0.774409
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.677034
Iter 8/10: OSS cache speed: 0.801574
Iter 8/10: ladvise speed: 0.90713
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.693109
Iter 9/10: OSS cache speed: 1.03402
Iter 9/10: ladvise speed: 1.09889
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.840637
Iter 10/10: OSS cache speed: 1.25352
Iter 10/10: ladvise speed: 0.920294
Average uncached read: .58
Average speedup with OSS cached read:  .72 = +24%
Average speedup with ladvise willread:  .75 = +29%
fail_loc=0