== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:56:06 (1780977366)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 1.99808 s, 52.5 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: 0.634747
Iter 1/10: OSS cache speed: 0.581942
Iter 1/10: ladvise speed: 0.584526
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 0.558712
Iter 2/10: OSS cache speed: 0.566449
Iter 2/10: ladvise speed: 0.576614
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 0.511715
Iter 3/10: OSS cache speed: 0.613852
Iter 3/10: ladvise speed: 0.573575
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 0.550806
Iter 4/10: OSS cache speed: 0.623427
Iter 4/10: ladvise speed: 0.450464
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 0.504336
Iter 5/10: OSS cache speed: 0.62564
Iter 5/10: ladvise speed: 0.553757
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 0.60072
Iter 6/10: OSS cache speed: 0.653506
Iter 6/10: ladvise speed: 0.48645
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 0.534267
Iter 7/10: OSS cache speed: 0.577891
Iter 7/10: ladvise speed: 0.508802
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 0.565672
Iter 8/10: OSS cache speed: 0.571988
Iter 8/10: ladvise speed: 0.675386
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 0.607223
Iter 9/10: OSS cache speed: 0.625438
Iter 9/10: ladvise speed: 0.609475
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 0.645984
Iter 10/10: OSS cache speed: 0.609369
Iter 10/10: ladvise speed: 0.574753
Average uncached read: .57
Average speedup with OSS cached read:  .60 = +5.26%
Average speedup with ladvise willread:  .55 = +-3.50%
/home/green/git/lustre-release/lustre/tests/sanity.sh: line 21778: 0ü’v: < 20 : syntax error: operand expected (error token is "< 20 ")
lfs ladvise: cannot give advice: Unknown error 524 (524)
ladvise: cannot give advice 'dontneed' to file '/mnt/lustre/f255a.sanity': Unknown error 524
osd-zfs does not support dontneed or drop_caches