== sanity test 255a: check 'lfs ladvise -a willread' ===== 16:30:47 (1722544247)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.551933 s, 190 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: 4.68853
Iter 1/10: OSS cache speed: 5.66203
Iter 1/10: ladvise speed: 5.79454
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.81082
Iter 2/10: OSS cache speed: 5.74009
Iter 2/10: ladvise speed: 5.1677
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.18264
Iter 3/10: OSS cache speed: 5.47573
Iter 3/10: ladvise speed: 5.67623
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 6.0078
Iter 4/10: OSS cache speed: 5.98446
Iter 4/10: ladvise speed: 5.37761
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.63045
Iter 5/10: OSS cache speed: 4.87486
Iter 5/10: ladvise speed: 4.72917
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.36459
Iter 6/10: OSS cache speed: 4.87143
Iter 6/10: ladvise speed: 4.46156
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.31985
Iter 7/10: OSS cache speed: 1.79369
Iter 7/10: ladvise speed: 1.9705
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.14982
Iter 8/10: OSS cache speed: 1.92238
Iter 8/10: ladvise speed: 2.12289
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.96081
Iter 9/10: OSS cache speed: 3.21664
Iter 9/10: ladvise speed: 2.2523
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 1.85285
Iter 10/10: OSS cache speed: 1.96564
Iter 10/10: ladvise speed: 2.73837
Average uncached read: 3.99
Average speedup with OSS cached read:  4.15 = +4.01%
Average speedup with ladvise willread:  4.02 = +.75%
Speedup with OSS cached read less than 20%,  got 4.15%. Skipping ladvise willread check.