== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:19:58 (1746155998)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 5.43862 s, 19.3 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-ffff8800b6380000.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.829691
Iter 1/10: OSS cache speed: 0.962171
Iter 1/10: ladvise speed: 0.909599
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.838519
Iter 2/10: OSS cache speed: 0.981309
Iter 2/10: ladvise speed: 0.872261
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.837701
Iter 3/10: OSS cache speed: 0.995091
Iter 3/10: ladvise speed: 0.990502
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.812386
Iter 4/10: OSS cache speed: 0.91549
Iter 4/10: ladvise speed: 1.05079
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.852271
Iter 5/10: OSS cache speed: 0.9816
Iter 5/10: ladvise speed: 1.00225
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.937997
Iter 6/10: OSS cache speed: 1.15605
Iter 6/10: ladvise speed: 1.04802
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.901399
Iter 7/10: OSS cache speed: 0.98538
Iter 7/10: ladvise speed: 1.07332
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.791159
Iter 8/10: OSS cache speed: 0.930722
Iter 8/10: ladvise speed: 0.882578
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.795347
Iter 9/10: OSS cache speed: 0.956691
Iter 9/10: ladvise speed: 1.09106
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.859802
Iter 10/10: OSS cache speed: 0.872691
Iter 10/10: ladvise speed: 1.07402
Average uncached read: .84
Average speedup with OSS cached read:  .97 = +15%
Average speedup with ladvise willread:  .99 = +17%
Speedup with OSS cached read less than 20%,  got 15%. Skipping ladvise willread check.
fail_loc=0