== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:32:57 (1748989977)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.605968 s, 173 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: 2.775
Iter 1/10: OSS cache speed: 2.75196
Iter 1/10: ladvise speed: 2.74309
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.65665
Iter 2/10: OSS cache speed: 2.60333
Iter 2/10: ladvise speed: 3.40509
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.86101
Iter 3/10: OSS cache speed: 2.78315
Iter 3/10: ladvise speed: 2.63934
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.79854
Iter 4/10: OSS cache speed: 4.07132
Iter 4/10: ladvise speed: 3.49021
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.43246
Iter 5/10: OSS cache speed: 4.04587
Iter 5/10: ladvise speed: 2.76587
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.40721
Iter 6/10: OSS cache speed: 2.89498
Iter 6/10: ladvise speed: 2.6207
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.78278
Iter 7/10: OSS cache speed: 2.70173
Iter 7/10: ladvise speed: 3.05926
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.08494
Iter 8/10: OSS cache speed: 2.7911
Iter 8/10: ladvise speed: 3.2297
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.46284
Iter 9/10: OSS cache speed: 4.4524
Iter 9/10: ladvise speed: 2.98788
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.35273
Iter 10/10: OSS cache speed: 4.863
Iter 10/10: ladvise speed: 4.98606
Average uncached read: 3.36
Average speedup with OSS cached read:  3.39 = +.89%
Average speedup with ladvise willread:  3.19 = +-5.05%
Speedup with OSS cached read less than 20%,  got 3.39%. Skipping ladvise willread check.