No, I'm getting 8 answers back in about 3.4 seconds when using simultaneous.
basement owfs # time cat uncached/10.*/temperature
68 66.2 60.8 62.2625 33.9125 60.6875
65.6375 41.5625
real 0m11.908s
user 0m0.000s
sys 0m0.004s
basement owfs # echo 1 > simultaneous/temperature
basement owfs # time cat uncached/10.*/temperature
68 66.2 60.8 62.15 34.025 60.6875
65.6375 41.5625
real 0m3.393s
user 0m0.004s
sys 0m0.000s
basement owfs #
So why is there a delay on the first read? I waited a second or so between
writing to simultaneous and reading the temperatures. Is the simultaneous
convert command not sent until the first read is attempted?
-Ben
On 12/11/06, Jerry Scharf <[EMAIL PROTECTED]> wrote:
Ben Griffith wrote:
> I just tried it by adding an unpowered sensor to my net and doing the
> following...
>
> echo 1 > simultaneous/temperature
> cat 10.*/temperature
>
> The result was that it paused to do the conversion on the one unpowered
> sensor, and all the powered ones came up right away. The unpowered
> sensor probably tries to do the conversion with all the powered ones,
> but since the data bus isn't being held high the conversion fails.
>
>
The first guy will delay, then the others come up quickly after that. I
think the sensors are smart enough to know they are on parasitic power
and ignore the simultaneous command.
Out of curiosity, are you getting more the 5 answers a second when
running simultaneous not from cache? If so, I will need to look into my
setup a bit more.
jerry
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