== sanity test 255a: check 'lfs ladvise -a willread' ===== 14:29:50 (1781029790)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 5.91316 s, 17.7 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-ffff8cff04fcf000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 1.22486
Iter 1/10: OSS cache speed: 1.3086
Iter 1/10: ladvise speed: 1.64272
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 1.53093
Iter 2/10: OSS cache speed: 1.84455
Iter 2/10: ladvise speed: 1.79248
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.56431
Iter 3/10: OSS cache speed: 1.63638
Iter 3/10: ladvise speed: 1.78998
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.78794
Iter 4/10: OSS cache speed: 1.40692
Iter 4/10: ladvise speed: 1.68888
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.50029
Iter 5/10: OSS cache speed: 2.05386
Iter 5/10: ladvise speed: 2.42363
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.3287
Iter 6/10: OSS cache speed: 2.56336
Iter 6/10: ladvise speed: 2.33461
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.17986
Iter 7/10: OSS cache speed: 2.33225
Iter 7/10: ladvise speed: 2.34658
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.1465
Iter 8/10: OSS cache speed: 2.26698
Iter 8/10: ladvise speed: 2.39712
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.19054
Iter 9/10: OSS cache speed: 2.42261
Iter 9/10: ladvise speed: 2.38427
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.19658
Iter 10/10: OSS cache speed: 2.36815
Iter 10/10: ladvise speed: 2.27871
Average uncached read: 1.86
Average speedup with OSS cached read:  2.02 = +8%
Average speedup with ladvise willread:  2.10 = +12%
Speedup with OSS cached read less than 20%,  got 8%. Skipping ladvise willread check.
fail_loc=0