Computer system providing numeric calculations with less resource usage

1. A computer-implemented method executed by a computing system comprising one or more computers communicatively connected to a data store, the method comprising:

receiving, from a client computing device, a request to perform a calculation, wherein data items needed for the calculation are identified based on the request, and wherein the computing system is a multi-tenant system in which client data for different tenants is stored together but subject to access control procedures, wherein the calculation comprises a plurality of parallel computations corresponding to a plurality of identities;

retrieving the data items from the data store into a digital computer memory;

generating a plurality of execution graphs for an in-memory execution of the calculation, wherein each of the plurality of execution graphs is for a particular tenant among a plurality of different tenants associated with the multi-tenant system, and wherein each of the plurality of execution graphs corresponds to each of the plurality of identities;

executing the calculation by traversing the plurality of execution graphs using a graph traversal algorithm to generate a result to the request; and

storing, in the data store, the result.

2. The method of claim 1 , wherein each of the plurality of execution graphs comprises one or more nodes, wherein each node comprises executable program instructions to perform at least one or more steps of the calculation and at least one of the data items needed by the at least one or more steps of the calculation.

3. The method of claim 2 , wherein two nodes of the one or more nodes for a particular graph are connected by an edge that represents a dependency between the two nodes and guidance on an order of execution of nodes.

4. The method of claim 2 , wherein a node of the one or more nodes for a first graph is dependent on a second graph.

5. The method of claim 2 , further comprising:

determining a first node of a particular graph of the plurality of execution graphs will execute on a third computing device and a second node of the particular graph of the plurality of execution graphs will execute on a fourth computing device; and

executing, in parallel, the first node by the third computing device and the second node by the fourth computing device.

6. The method of claim 1 , further comprising:

determining a first graph of the plurality of execution graphs will execute on a first computing device and a second graph of the plurality of execution graphs will execute on a second computing device; and

executing, in parallel, the first graph by the first computing device and the second graph by the second computing device.

7. The method of claim 1 , wherein the generating results in a digitally stored in-memory list of execution graphs.

8. The method of claim 7 , wherein traversing the plurality of execution graphs comprises traversing the in-memory list executing each of the plurality of execution graphs based on input from an in-memory context comprising instructions for the calculation of that graph.

9. The method of claim 1 , wherein the data store is a distributed data store.

10. The method of claim 1 , wherein the computing system comprises a public cloud.

11. The method of claim 1 , further comprising causing displaying, on the client computing device, the result.

12. A computing system comprising:

one or more computers communicatively connected to a data store, the one or more computers comprising one or more processors and one or more computer-readable non-transitory storage media coupled to one or more of the processors and comprising instructions operable when executed by the one or more processors to cause the one or more computers to:

receive, from a client computing device, a request to perform a calculation, wherein data items needed for the calculation are identified based on the request, and wherein the computing system is a multi-tenant system in which client data for different tenants is stored together but subject to access control procedures, wherein the calculation comprises a plurality of parallel computations corresponding to a plurality of identities;

retrieve the data items from the data store into a digital computer memory;

generate a plurality of execution graphs for an in-memory execution of the calculation, wherein each of the plurality of execution graphs is for a particular tenant among a plurality of different tenants associated with the multi-tenant system, and wherein each of the plurality of execution graphs corresponds to each of the plurality of identities;

execute the calculation by traversing the plurality of execution graphs using a graph traversal algorithm to generate a result to the request; and

store, in the data store, the result.

13. The system of claim 12 , wherein each of the plurality of execution graphs comprises one or more nodes, wherein each node comprises executable program instructions to perform at least one or more steps of the calculation and at least one of the data items needed by the at least one or more steps of the calculation.

14. The system of claim 13 , wherein two nodes of the one or more nodes for a particular graph are connected by an edge that represents a dependency between the two nodes and guidance on an order of execution of nodes.

15. The system of claim 13 , wherein a node of the one or more nodes for a first graph is dependent on a second graph.

16. The system of claim 13 , wherein the one or more processors are further operable when executing the instructions to:

determine a first node of a particular graph of the plurality of execution graphs will execute on a third computing device and a second node of the particular graph of the plurality of execution graphs will execute on a fourth computing device; and

execute, in parallel, the first node by the third computing device and the second node by the fourth computing device.

17. The system of claim 12 , wherein the one or more processors are further operable when executing the instructions to:

determine a first graph of the plurality of execution graphs will execute on a first computing device and a second graph of the plurality of execution graphs will execute on a second computing device; and

execute, in parallel, the first graph by the first computing device and the second graph by the second computing device.

18. The system of claim 12 , wherein the generating results in a digitally stored in-memory list of execution graphs.

19. The system of claim 18 , wherein traversing the plurality of execution graphs comprises traversing the in-memory list executing each of the plurality of execution graphs based on input from an in-memory context comprising instructions for the calculation of the graph.

20. One or more computer-readable non-transitory storage media embodying software that is operable when executed by a computing system comprising one or more computers communicatively connected to a data store to:

receive, from a client computing device, a request to perform a calculation, wherein data items needed for the calculation are identified based on the request, and wherein the computing system is a multi-tenant system in which client data for different tenants is stored together but subject to access control procedures, wherein the calculation comprises a plurality of parallel computations corresponding to a plurality of identities;

retrieve the data items from the data store into a digital computer memory;

generate a plurality of execution graphs for an in-memory execution of the calculation, wherein each of the plurality of execution graphs is for a particular tenant among a plurality of different tenants associated with the multi-tenant system, and wherein each of the plurality of execution graphs corresponds to each of the plurality of identities;

execute the calculation by traversing the plurality of execution graphs using a graph traversal algorithm to generate a result to the request; and

store, in the data store, the result.