== sanity test 255a: check 'lfs ladvise -a willread' ===== 09:08:27 (1747400907)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.657014 s, 160 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: 3.41841
Iter 1/10: OSS cache speed: 4.5702
Iter 1/10: ladvise speed: 6.04195
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.63037
Iter 2/10: OSS cache speed: 5.32601
Iter 2/10: ladvise speed: 6.78448
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.26456
Iter 3/10: OSS cache speed: 7.07115
Iter 3/10: ladvise speed: 7.34114
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.377
Iter 4/10: OSS cache speed: 6.50399
Iter 4/10: ladvise speed: 7.52676
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 6.22271
Iter 5/10: OSS cache speed: 6.57019
Iter 5/10: ladvise speed: 6.5737
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.16053
Iter 6/10: OSS cache speed: 6.14773
Iter 6/10: ladvise speed: 6.99277
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 6.38898
Iter 7/10: OSS cache speed: 6.36531
Iter 7/10: ladvise speed: 7.10667
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.53495
Iter 8/10: OSS cache speed: 5.33062
Iter 8/10: ladvise speed: 6.23764
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.54266
Iter 9/10: OSS cache speed: 4.66644
Iter 9/10: ladvise speed: 4.27579
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 3.32309
Iter 10/10: OSS cache speed: 4.02888
Iter 10/10: ladvise speed: 3.67422
Average uncached read: 4.78
Average speedup with OSS cached read:  5.65 = +18.20%
Average speedup with ladvise willread:  6.25 = +30.75%
Speedup with OSS cached read less than 20%,  got 5.65%. Skipping ladvise willread check.