== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:59:39 (1782532779)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 6.81448 s, 15.4 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-ffff952355f68800.hybrid_io=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 0.637679
Iter 1/10: OSS cache speed: 0.740078
Iter 1/10: ladvise speed: 0.773749
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.699517
Iter 2/10: OSS cache speed: 0.897495
Iter 2/10: ladvise speed: 1.28078
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 1.22147
Iter 3/10: OSS cache speed: 1.51539
Iter 3/10: ladvise speed: 1.54854
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 1.17744
Iter 4/10: OSS cache speed: 1.1261
Iter 4/10: ladvise speed: 1.5277
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 1.50826
Iter 5/10: OSS cache speed: 1.93836
Iter 5/10: ladvise speed: 1.61269
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.50427
Iter 6/10: OSS cache speed: 1.55451
Iter 6/10: ladvise speed: 1.74075
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.58011
Iter 7/10: OSS cache speed: 1.65715
Iter 7/10: ladvise speed: 2.02078
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.93132
Iter 8/10: OSS cache speed: 2.35048
Iter 8/10: ladvise speed: 2.46958
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.92091
Iter 9/10: OSS cache speed: 2.5167
Iter 9/10: ladvise speed: 2.36334
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.10954
Iter 10/10: OSS cache speed: 2.25924
Iter 10/10: ladvise speed: 2.36746
Average uncached read: 1.42
Average speedup with OSS cached read:  1.65 = +16%
Average speedup with ladvise willread:  1.77 = +24%
Speedup with OSS cached read less than 20%,  got 16%. Skipping ladvise willread check.
fail_loc=0