== sanity test 255a: check 'lfs ladvise -a willread' ===== 21:58:46 (1767841126)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.827807 s, 127 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: 3.17787
Iter 1/10: OSS cache speed: 4.01444
Iter 1/10: ladvise speed: 3.43898
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.20854
Iter 2/10: OSS cache speed: 4.68699
Iter 2/10: ladvise speed: 4.81912
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.36573
Iter 3/10: OSS cache speed: 4.45656
Iter 3/10: ladvise speed: 4.37428
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.3261
Iter 4/10: OSS cache speed: 4.42577
Iter 4/10: ladvise speed: 4.29599
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.21903
Iter 5/10: OSS cache speed: 4.64724
Iter 5/10: ladvise speed: 3.02938
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.14628
Iter 6/10: OSS cache speed: 1.33297
Iter 6/10: ladvise speed: 1.45965
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.43443
Iter 7/10: OSS cache speed: 1.71769
Iter 7/10: ladvise speed: 1.40082
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.64116
Iter 8/10: OSS cache speed: 1.51758
Iter 8/10: ladvise speed: 1.86081
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.76442
Iter 9/10: OSS cache speed: 1.84067
Iter 9/10: ladvise speed: 1.68019
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.55189
Iter 10/10: OSS cache speed: 1.81041
Iter 10/10: ladvise speed: 2.19473
Average uncached read: 2.88
Average speedup with OSS cached read:  3.04 = +5.55%
Average speedup with ladvise willread:  2.85 = +-1.04%
Speedup with OSS cached read less than 20%,  got 3.04%. Skipping ladvise willread check.