== sanity test 255a: check 'lfs ladvise -a willread' ===== 11:07:05 (1730822825)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.532625 s, 197 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: 3.67601
Iter 1/10: OSS cache speed: 4.23914
Iter 1/10: ladvise speed: 4.45634
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.94817
Iter 2/10: OSS cache speed: 3.79888
Iter 2/10: ladvise speed: 3.78907
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.75645
Iter 3/10: OSS cache speed: 4.73447
Iter 3/10: ladvise speed: 4.87172
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.68279
Iter 4/10: OSS cache speed: 3.6031
Iter 4/10: ladvise speed: 3.42962
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.18695
Iter 5/10: OSS cache speed: 4.57032
Iter 5/10: ladvise speed: 4.29188
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.84458
Iter 6/10: OSS cache speed: 4.80474
Iter 6/10: ladvise speed: 4.65893
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.27198
Iter 7/10: OSS cache speed: 4.88847
Iter 7/10: ladvise speed: 4.98172
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.48221
Iter 8/10: OSS cache speed: 4.95939
Iter 8/10: ladvise speed: 3.508
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.9682
Iter 9/10: OSS cache speed: 3.13617
Iter 9/10: ladvise speed: 4.64414
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.99706
Iter 10/10: OSS cache speed: 4.95183
Iter 10/10: ladvise speed: 4.7369
Average uncached read: 4.38
Average speedup with OSS cached read:  4.36 = +-.45%
Average speedup with ladvise willread:  4.33 = +-1.14%
Speedup with OSS cached read less than 20%,  got 4.36%. Skipping ladvise willread check.