== sanity test 255a: check 'lfs ladvise -a willread' ===== 05:22:05 (1787822525)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.9792 s, 9.6 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-ffff98fd47961000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.357558
Iter 1/10: OSS cache speed: 0.442207
Iter 1/10: ladvise speed: 0.436341
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.393624
Iter 2/10: OSS cache speed: 0.441893
Iter 2/10: ladvise speed: 0.429123
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.360294
Iter 3/10: OSS cache speed: 0.457419
Iter 3/10: ladvise speed: 0.441953
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.393797
Iter 4/10: OSS cache speed: 0.417543
Iter 4/10: ladvise speed: 0.471889
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.416018
Iter 5/10: OSS cache speed: 0.373364
Iter 5/10: ladvise speed: 0.486258
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.42418
Iter 6/10: OSS cache speed: 0.456414
Iter 6/10: ladvise speed: 0.442808
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.390083
Iter 7/10: OSS cache speed: 0.467832
Iter 7/10: ladvise speed: 0.42132
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.387174
Iter 8/10: OSS cache speed: 0.382964
Iter 8/10: ladvise speed: 0.441437
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.377587
Iter 9/10: OSS cache speed: 0.403701
Iter 9/10: ladvise speed: 0.440428
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.376099
Iter 10/10: OSS cache speed: 0.366377
Iter 10/10: ladvise speed: 0.356996
Average uncached read: .38
Average speedup with OSS cached read:  .42 = +10%
Average speedup with ladvise willread:  .43 = +13%
Speedup with OSS cached read less than 20%,  got 10%. Skipping ladvise willread check.
fail_loc=0