== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:00:49 (1736985649)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.738025 s, 142 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=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 3.49172
Iter 1/10: OSS cache speed: 4.41899
Iter 1/10: ladvise speed: 4.61313
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.11742
Iter 2/10: OSS cache speed: 3.95144
Iter 2/10: ladvise speed: 3.74469
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.98934
Iter 3/10: OSS cache speed: 3.73798
Iter 3/10: ladvise speed: 4.4468
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.72524
Iter 4/10: OSS cache speed: 4.94516
Iter 4/10: ladvise speed: 4.16763
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.56391
Iter 5/10: OSS cache speed: 5.43843
Iter 5/10: ladvise speed: 6.28535
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.3954
Iter 6/10: OSS cache speed: 6.74164
Iter 6/10: ladvise speed: 6.18703
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.77118
Iter 7/10: OSS cache speed: 7.10314
Iter 7/10: ladvise speed: 6.74234
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 6.50546
Iter 8/10: OSS cache speed: 6.04978
Iter 8/10: ladvise speed: 6.96644
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.67699
Iter 9/10: OSS cache speed: 6.04074
Iter 9/10: ladvise speed: 5.53683
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.00893
Iter 10/10: OSS cache speed: 5.60444
Iter 10/10: ladvise speed: 6.27367
Average uncached read: 4.62
Average speedup with OSS cached read:  5.40 = +16.88%
Average speedup with ladvise willread:  5.49 = +18.83%
Speedup with OSS cached read less than 20%,  got 5.40%. Skipping ladvise willread check.