The Perform CHOP outputs many channels like frames-per-second, describing the current state of the TouchDesigner process. As channels they can be manipulated into user interfaces and calculations to adjust real-time self-tuning of the process.
It outputs the "cook time" of the prior frame that was drawn, which is a reflection of how many frames TouchDesigner cooked in the prior second. The
cook channel, when sent to a Trail CHOP shows which frames were cooked and which were skipped, useful in optimizing your work to reach a desired frame rate.
The Built-in Variables found on Dialogs -> Variables -> Built-in include more useful data on your running system. See also the Built-in Variables section of the Variables page.
Parameters - Perform Page
This is a listing of the channels output from the Perform CHOP.
Frames per Second
fps - The number of frames rendered in the last second.
msec - Amount of time each frame takes to cook in msec.
cook - Is equal to 1 when a frame is cooked and equal to 0 when a frame is skipped. It is often useful to view this channel in a Trail CHOP to see when frames are skipped (dropped).
Movie Read Ahead Misses
mvreadahead - How many times the movie read ahead failed to maintain the number of specified Read Ahead frames.
GPU Mem Used (MB)
gpumemused - Amount of GPU memory used (in megabytes).
Total GPU Mem (MB)
totalgpumem - Total amount of GPU memory available on the system (in megabytes).
Total Active OPs
activeops - How many OPs are actively cooking.
Total Deactivated OP Calls
deactivatedops - Number of calls to cook a component that has its Cooking Flag turned off.
totalops - Total number of OPs in the .toe file.
CPU Mem Used (MB)
cpumemused - Amount of CPU memory used (in megabytes).
cookstate - Monitors which frames actually cooked. Pass the Perform CHOP to a Trail CHOP to properly see the trail of frames that did and did not cook. (It appears as always 1 because the viewer is displaying only the current frame and not frames it missed.)
cookrealtime - Monitors the state of the realtime flag, determining if TouchDesigner is running in realtime mode or not.
cookrate - The global target cook rate (frames per second) of the project. This is the frames per second of the root component,
60, though due to frames taking too long to cook, the the actual frames per second may be lower.
Time Slice Step
timeslicestep - The number of frames that TouchDesigner stepped forward for the current cook. It's the length of the Time Slice in frames. It will be equal to 1 when the system is taking
1000/root.time.rate msec or less to complete one frame (16.666 msec for a rate of 60).
Time Slice Milliseconds
timeslicemsec - The length of the current Time Slice in milliseconds.
performmode - Monitors the state of Perform Mode.
Perform Window Focus
GPU Temperature (Slow)
gputemp - Monitors the temperature of the system's GPUs.
AC Line Status
aclinestatus - Indicates if the laptop's AC Charger is plugged in and active. 1 if AC line is detected, 0 otherwise.
batterycharging - Indicates if the battery is being charged. 1 if charging, 0 otherwise.
batterylife - Indicated charge remaining in battery, 1 is battery full, 0 is battery empty.
batterytime - Estimated time remaining in battery charge. Only works if AC Line is disconnected and battery is not being charged.
Expressions Using Cache
Parameters - Common Page
timeslice - Turning this on forces the channels to be "Time Sliced". A Time Slice is the time between the last cook frame and the current cook frame.
scope - To determine which channels get affected, some CHOPs use a Scope string on the Common page.
Sample Rate Match
srselect - ⊞ - Handle cases where multiple input CHOPs' sample rates are different. When Resampling occurs, the curves are interpolated according to the Interpolation Method Option, or "Linear" if the Interpolate Options are not available.
- Resample At First Input's Rate
first- Use rate of first input to resample others.
- Resample At Maximum Rate
max- Resample to the highest sample rate.
- Resample At Minimum Rate
min- Resample to the lowest sample rate.
- Error If Rates Differ
err- Doesn't accept conflicting sample rates.
exportmethod - ⊞ - This will determine how to connect the CHOP channel to the parameter. Refer to the Export article for more information.
- DAT Table by Index
datindex- Uses the docked DAT table and references the channel via the index of the channel in the CHOP.
- DAT Table by Name
datname- Uses the docked DAT table and references the channel via the name of the channel in the CHOP.
- Channel Name is Path:Parameter
autoname- The channel is the full destination of where to export to, such has
autoexportroot - This path points to the root node where all of the paths that exporting by Channel Name is Path:Parameter are relative to.
exporttable - The DAT used to hold the export information when using the DAT Table Export Methods (See above).
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To re-compute the output data of the Operators. An operator cooks when (1) its inputs change, (2) its Parameters change, (3) when the timeline moves forward in some cases, or (4) Scripting commands are run on the node. When the operator is a Gadget, it also cooks when a user interacts with it. When an operator cooks, it usually causes operators connected to its output to re-cook. When TouchDesigner draws the screen, it re-cooks all the necessary operators in all Networks, contributing to a frame's total "cook time".
The Graphics Processing Unit. This is the high-speed, many-core processor of the graphics card/chip that takes geometry, images and data from the CPU and creates images and processed data.
A Time Slice is the time from the last cook frame to the current cook frame. In CHOPs it is the set of short channels that only contain the CHOP channels' samples between the last and the current cook frame.
Mode where the network editing window is not open, your performance interface window(s) is open and you are running your application as fast as possible. See Designer Mode.
A parameter in most CHOPs that restricts which channels of that CHOP will be affected. Normally all channels of a CHOP are affected by the operator.
samples-per-second of a CHOP. Each CHOP in your network has a sample rate, whether it is used or not. The overall timeline has a "frame rate", which is the number of animation frames per second, generally your monitor display frequency.
Exporting is the connection of CHOP channels to parameters of operators. The output of each exporting CHOP is one or more channels, active only while the CHOP Viewer is on. The current value of a channel can be exported to a parameter of any operator, overriding that parameter's value. See Parameter.
Parameters in TouchDesigner are an operator's settings (numbers, menus, flags, strings, paths) which the user can alter. Parameters for any operator can be opened by right-clicking on the operator and selecting "Parameters..." A currently selected operator's parameters can be viewed in a Network Editor by pressing the keyboard shortcut 'p'.