== sanity test 255a: check 'lfs ladvise -a willread' ===== 19:10:57 (1736986257)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.578705 s, 181 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: 4.14949
Iter 1/10: OSS cache speed: 4.50679
Iter 1/10: ladvise speed: 4.66205
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.69824
Iter 2/10: OSS cache speed: 4.72953
Iter 2/10: ladvise speed: 4.96926
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.42152
Iter 3/10: OSS cache speed: 4.583
Iter 3/10: ladvise speed: 4.48188
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.66608
Iter 4/10: OSS cache speed: 5.01963
Iter 4/10: ladvise speed: 5.07914
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.66698
Iter 5/10: OSS cache speed: 4.55344
Iter 5/10: ladvise speed: 4.3171
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.30598
Iter 6/10: OSS cache speed: 4.39307
Iter 6/10: ladvise speed: 4.6229
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.75828
Iter 7/10: OSS cache speed: 4.76049
Iter 7/10: ladvise speed: 4.77286
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.8864
Iter 8/10: OSS cache speed: 4.65438
Iter 8/10: ladvise speed: 4.84409
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.55478
Iter 9/10: OSS cache speed: 4.79166
Iter 9/10: ladvise speed: 4.78287
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.66257
Iter 10/10: OSS cache speed: 4.13418
Iter 10/10: ladvise speed: 4.38861
Average uncached read: 4.67
Average speedup with OSS cached read:  4.61 = +-1.28%
Average speedup with ladvise willread:  4.69 = +.42%
Speedup with OSS cached read less than 20%,  got 4.61%. Skipping ladvise willread check.